worker.c File Reference

#include "postgres.h"
#include <sys/stat.h>
#include <unistd.h>
#include "access/table.h"
#include "access/tableam.h"
#include "access/twophase.h"
#include "access/xact.h"
#include "catalog/indexing.h"
#include "catalog/pg_inherits.h"
#include "catalog/pg_subscription.h"
#include "catalog/pg_subscription_rel.h"
#include "commands/tablecmds.h"
#include "commands/trigger.h"
#include "executor/executor.h"
#include "executor/execPartition.h"
#include "libpq/pqformat.h"
#include "miscadmin.h"
#include "optimizer/optimizer.h"
#include "parser/parse_relation.h"
#include "pgstat.h"
#include "postmaster/bgworker.h"
#include "postmaster/interrupt.h"
#include "postmaster/walwriter.h"
#include "replication/conflict.h"
#include "replication/logicallauncher.h"
#include "replication/logicalproto.h"
#include "replication/logicalrelation.h"
#include "replication/logicalworker.h"
#include "replication/origin.h"
#include "replication/walreceiver.h"
#include "replication/worker_internal.h"
#include "rewrite/rewriteHandler.h"
#include "storage/buffile.h"
#include "storage/ipc.h"
#include "storage/lmgr.h"
#include "tcop/tcopprot.h"
#include "utils/acl.h"
#include "utils/dynahash.h"
#include "utils/guc.h"
#include "utils/inval.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/pg_lsn.h"
#include "utils/rel.h"
#include "utils/rls.h"
#include "utils/snapmgr.h"
#include "utils/syscache.h"
#include "utils/usercontext.h"

Include dependency graph for worker.c:

Go to the source code of this file.

Data Structures
struct	FlushPosition
struct	ApplyExecutionData
struct	ApplyErrorCallbackArg
struct	SubXactInfo
struct	ApplySubXactData

Macros
#define	NAPTIME_PER_CYCLE   1000 /* max sleep time between cycles (1s) */
#define	is_skipping_changes()   (unlikely(!XLogRecPtrIsInvalid(skip_xact_finish_lsn)))

Typedefs
typedef struct FlushPosition	FlushPosition
typedef struct ApplyExecutionData	ApplyExecutionData
typedef struct ApplyErrorCallbackArg	ApplyErrorCallbackArg
typedef struct SubXactInfo	SubXactInfo
typedef struct ApplySubXactData	ApplySubXactData

Enumerations
enum	TransApplyAction {   TRANS_LEADER_APPLY , TRANS_LEADER_SERIALIZE , TRANS_LEADER_SEND_TO_PARALLEL , TRANS_LEADER_PARTIAL_SERIALIZE ,   TRANS_PARALLEL_APPLY }

Functions
static void	subxact_filename (char *path, Oid subid, TransactionId xid)
static void	changes_filename (char *path, Oid subid, TransactionId xid)
static void	subxact_info_write (Oid subid, TransactionId xid)
static void	subxact_info_read (Oid subid, TransactionId xid)
static void	subxact_info_add (TransactionId xid)
static void	cleanup_subxact_info (void)
static void	stream_open_file (Oid subid, TransactionId xid, bool first_segment)
static void	stream_write_change (char action, StringInfo s)
static void	stream_open_and_write_change (TransactionId xid, char action, StringInfo s)
static void	stream_close_file (void)
static void	send_feedback (XLogRecPtr recvpos, bool force, bool requestReply)
static void	apply_handle_commit_internal (LogicalRepCommitData *commit_data)
static void	apply_handle_insert_internal (ApplyExecutionData *edata, ResultRelInfo *relinfo, TupleTableSlot *remoteslot)
static void	apply_handle_update_internal (ApplyExecutionData *edata, ResultRelInfo *relinfo, TupleTableSlot *remoteslot, LogicalRepTupleData *newtup, Oid localindexoid)
static void	apply_handle_delete_internal (ApplyExecutionData *edata, ResultRelInfo *relinfo, TupleTableSlot *remoteslot, Oid localindexoid)
static bool	FindReplTupleInLocalRel (ApplyExecutionData *edata, Relation localrel, LogicalRepRelation *remoterel, Oid localidxoid, TupleTableSlot *remoteslot, TupleTableSlot **localslot)
static void	apply_handle_tuple_routing (ApplyExecutionData *edata, TupleTableSlot *remoteslot, LogicalRepTupleData *newtup, CmdType operation)
static void	maybe_start_skipping_changes (XLogRecPtr finish_lsn)
static void	stop_skipping_changes (void)
static void	clear_subscription_skip_lsn (XLogRecPtr finish_lsn)
static void	set_apply_error_context_xact (TransactionId xid, XLogRecPtr lsn)
static void	reset_apply_error_context_info (void)
static TransApplyAction	get_transaction_apply_action (TransactionId xid, ParallelApplyWorkerInfo **winfo)
void	ReplicationOriginNameForLogicalRep (Oid suboid, Oid relid, char *originname, Size szoriginname)
static bool	should_apply_changes_for_rel (LogicalRepRelMapEntry *rel)
static void	begin_replication_step (void)
static void	end_replication_step (void)
static bool	handle_streamed_transaction (LogicalRepMsgType action, StringInfo s)
static ApplyExecutionData *	create_edata_for_relation (LogicalRepRelMapEntry *rel)
static void	finish_edata (ApplyExecutionData *edata)
static void	slot_fill_defaults (LogicalRepRelMapEntry *rel, EState *estate, TupleTableSlot *slot)
static void	slot_store_data (TupleTableSlot *slot, LogicalRepRelMapEntry *rel, LogicalRepTupleData *tupleData)
static void	slot_modify_data (TupleTableSlot *slot, TupleTableSlot *srcslot, LogicalRepRelMapEntry *rel, LogicalRepTupleData *tupleData)
static void	apply_handle_begin (StringInfo s)
static void	apply_handle_commit (StringInfo s)
static void	apply_handle_begin_prepare (StringInfo s)
static void	apply_handle_prepare_internal (LogicalRepPreparedTxnData *prepare_data)
static void	apply_handle_prepare (StringInfo s)
static void	apply_handle_commit_prepared (StringInfo s)
static void	apply_handle_rollback_prepared (StringInfo s)
static void	apply_handle_stream_prepare (StringInfo s)
static void	apply_handle_origin (StringInfo s)
void	stream_start_internal (TransactionId xid, bool first_segment)
static void	apply_handle_stream_start (StringInfo s)
void	stream_stop_internal (TransactionId xid)
static void	apply_handle_stream_stop (StringInfo s)
static void	stream_abort_internal (TransactionId xid, TransactionId subxid)
static void	apply_handle_stream_abort (StringInfo s)
static void	ensure_last_message (FileSet *stream_fileset, TransactionId xid, int fileno, off_t offset)
void	apply_spooled_messages (FileSet *stream_fileset, TransactionId xid, XLogRecPtr lsn)
static void	apply_handle_stream_commit (StringInfo s)
static void	apply_handle_relation (StringInfo s)
static void	apply_handle_type (StringInfo s)
static void	TargetPrivilegesCheck (Relation rel, AclMode mode)
static void	apply_handle_insert (StringInfo s)
static void	check_relation_updatable (LogicalRepRelMapEntry *rel)
static void	apply_handle_update (StringInfo s)
static void	apply_handle_delete (StringInfo s)
static void	apply_handle_truncate (StringInfo s)
void	apply_dispatch (StringInfo s)
static void	get_flush_position (XLogRecPtr *write, XLogRecPtr *flush, bool *have_pending_txes)
void	store_flush_position (XLogRecPtr remote_lsn, XLogRecPtr local_lsn)
static void	UpdateWorkerStats (XLogRecPtr last_lsn, TimestampTz send_time, bool reply)
static void	LogicalRepApplyLoop (XLogRecPtr last_received)
static void	apply_worker_exit (void)
void	maybe_reread_subscription (void)
static void	subscription_change_cb (Datum arg, int cacheid, uint32 hashvalue)
void	stream_cleanup_files (Oid subid, TransactionId xid)
void	set_stream_options (WalRcvStreamOptions *options, char *slotname, XLogRecPtr *origin_startpos)
void	start_apply (XLogRecPtr origin_startpos)
static void	run_apply_worker ()
void	InitializeLogRepWorker (void)
static void	replorigin_reset (int code, Datum arg)
void	SetupApplyOrSyncWorker (int worker_slot)
void	ApplyWorkerMain (Datum main_arg)
void	DisableSubscriptionAndExit (void)
bool	IsLogicalWorker (void)
bool	IsLogicalParallelApplyWorker (void)
void	apply_error_callback (void *arg)
void	LogicalRepWorkersWakeupAtCommit (Oid subid)
void	AtEOXact_LogicalRepWorkers (bool isCommit)
void	set_apply_error_context_origin (char *originname)

Variables
static dlist_head	lsn_mapping = DLIST_STATIC_INIT(lsn_mapping)
static ApplyErrorCallbackArg	apply_error_callback_arg
ErrorContextCallback *	apply_error_context_stack = NULL
MemoryContext	ApplyMessageContext = NULL
MemoryContext	ApplyContext = NULL
static MemoryContext	LogicalStreamingContext = NULL
WalReceiverConn *	LogRepWorkerWalRcvConn = NULL
Subscription *	MySubscription = NULL
static bool	MySubscriptionValid = false
static List *	on_commit_wakeup_workers_subids = NIL
bool	in_remote_transaction = false
static XLogRecPtr	remote_final_lsn = InvalidXLogRecPtr
static bool	in_streamed_transaction = false
static TransactionId	stream_xid = InvalidTransactionId
static uint32	parallel_stream_nchanges = 0
bool	InitializingApplyWorker = false
static XLogRecPtr	skip_xact_finish_lsn = InvalidXLogRecPtr
static BufFile *	stream_fd = NULL
static ApplySubXactData	subxact_data = {0, 0, InvalidTransactionId, NULL}

Macro Definition Documentation

is_skipping_changes

#define is_skipping_changes

(

)

(unlikely(!XLogRecPtrIsInvalid(skip_xact_finish_lsn)))

Definition at line 337 of file worker.c.

NAPTIME_PER_CYCLE

#define NAPTIME_PER_CYCLE   1000 /* max sleep time between cycles (1s) */

Definition at line 196 of file worker.c.

Typedef Documentation

ApplyErrorCallbackArg

typedef struct ApplyErrorCallbackArg ApplyErrorCallbackArg

ApplyExecutionData

typedef struct ApplyExecutionData ApplyExecutionData

ApplySubXactData

typedef struct ApplySubXactData ApplySubXactData

FlushPosition

typedef struct FlushPosition FlushPosition

SubXactInfo

typedef struct SubXactInfo SubXactInfo

Enumeration Type Documentation

TransApplyAction

enum TransApplyAction

Enumerator
TRANS_LEADER_APPLY
TRANS_LEADER_SERIALIZE
TRANS_LEADER_SEND_TO_PARALLEL
TRANS_LEADER_PARTIAL_SERIALIZE
TRANS_PARALLEL_APPLY

Definition at line 266 of file worker.c.

{
    /* The action for non-streaming transactions. */
    TRANS_LEADER_APPLY,
 
    /* Actions for streaming transactions. */
    TRANS_LEADER_SERIALIZE,
    TRANS_LEADER_SEND_TO_PARALLEL,
    TRANS_LEADER_PARTIAL_SERIALIZE,
    TRANS_PARALLEL_APPLY,
} TransApplyAction;

Function Documentation

apply_dispatch()

void apply_dispatch

(

StringInfo

s

)

Definition at line 3364 of file worker.c.

{
    LogicalRepMsgType action = pq_getmsgbyte(s);
    LogicalRepMsgType saved_command;
 
    /*
     * Set the current command being applied. Since this function can be
     * called recursively when applying spooled changes, save the current
     * command.
     */
    saved_command = apply_error_callback_arg.command;
    apply_error_callback_arg.command = action;
 
    switch (action)
    {
        case LOGICAL_REP_MSG_BEGIN:
            apply_handle_begin(s);
            break;
 
        case LOGICAL_REP_MSG_COMMIT:
            apply_handle_commit(s);
            break;
 
        case LOGICAL_REP_MSG_INSERT:
            apply_handle_insert(s);
            break;
 
        case LOGICAL_REP_MSG_UPDATE:
            apply_handle_update(s);
            break;
 
        case LOGICAL_REP_MSG_DELETE:
            apply_handle_delete(s);
            break;
 
        case LOGICAL_REP_MSG_TRUNCATE:
            apply_handle_truncate(s);
            break;
 
        case LOGICAL_REP_MSG_RELATION:
            apply_handle_relation(s);
            break;
 
        case LOGICAL_REP_MSG_TYPE:
            apply_handle_type(s);
            break;
 
        case LOGICAL_REP_MSG_ORIGIN:
            apply_handle_origin(s);
            break;
 
        case LOGICAL_REP_MSG_MESSAGE:
 
            /*
             * Logical replication does not use generic logical messages yet.
             * Although, it could be used by other applications that use this
             * output plugin.
             */
            break;
 
        case LOGICAL_REP_MSG_STREAM_START:
            apply_handle_stream_start(s);
            break;
 
        case LOGICAL_REP_MSG_STREAM_STOP:
            apply_handle_stream_stop(s);
            break;
 
        case LOGICAL_REP_MSG_STREAM_ABORT:
            apply_handle_stream_abort(s);
            break;
 
        case LOGICAL_REP_MSG_STREAM_COMMIT:
            apply_handle_stream_commit(s);
            break;
 
        case LOGICAL_REP_MSG_BEGIN_PREPARE:
            apply_handle_begin_prepare(s);
            break;
 
        case LOGICAL_REP_MSG_PREPARE:
            apply_handle_prepare(s);
            break;
 
        case LOGICAL_REP_MSG_COMMIT_PREPARED:
            apply_handle_commit_prepared(s);
            break;
 
        case LOGICAL_REP_MSG_ROLLBACK_PREPARED:
            apply_handle_rollback_prepared(s);
            break;
 
        case LOGICAL_REP_MSG_STREAM_PREPARE:
            apply_handle_stream_prepare(s);
            break;
 
        default:
            ereport(ERROR,
                    (errcode(ERRCODE_PROTOCOL_VIOLATION),
                     errmsg("invalid logical replication message type \"??? (%d)\"", action)));
    }
 
    /* Reset the current command */
    apply_error_callback_arg.command = saved_command;
}

References generate_unaccent_rules::action, apply_error_callback_arg, apply_handle_begin(), apply_handle_begin_prepare(), apply_handle_commit(), apply_handle_commit_prepared(), apply_handle_delete(), apply_handle_insert(), apply_handle_origin(), apply_handle_prepare(), apply_handle_relation(), apply_handle_rollback_prepared(), apply_handle_stream_abort(), apply_handle_stream_commit(), apply_handle_stream_prepare(), apply_handle_stream_start(), apply_handle_stream_stop(), apply_handle_truncate(), apply_handle_type(), apply_handle_update(), ApplyErrorCallbackArg::command, ereport, errcode(), errmsg(), ERROR, LOGICAL_REP_MSG_BEGIN, LOGICAL_REP_MSG_BEGIN_PREPARE, LOGICAL_REP_MSG_COMMIT, LOGICAL_REP_MSG_COMMIT_PREPARED, LOGICAL_REP_MSG_DELETE, LOGICAL_REP_MSG_INSERT, LOGICAL_REP_MSG_MESSAGE, LOGICAL_REP_MSG_ORIGIN, LOGICAL_REP_MSG_PREPARE, LOGICAL_REP_MSG_RELATION, LOGICAL_REP_MSG_ROLLBACK_PREPARED, LOGICAL_REP_MSG_STREAM_ABORT, LOGICAL_REP_MSG_STREAM_COMMIT, LOGICAL_REP_MSG_STREAM_PREPARE, LOGICAL_REP_MSG_STREAM_START, LOGICAL_REP_MSG_STREAM_STOP, LOGICAL_REP_MSG_TRUNCATE, LOGICAL_REP_MSG_TYPE, LOGICAL_REP_MSG_UPDATE, and pq_getmsgbyte().

Referenced by apply_spooled_messages(), LogicalParallelApplyLoop(), and LogicalRepApplyLoop().

apply_error_callback()

void apply_error_callback

(

void *

arg

)

Definition at line 4992 of file worker.c.

{
    ApplyErrorCallbackArg *errarg = &apply_error_callback_arg;
    int         elevel;
 
    if (apply_error_callback_arg.command == 0)
        return;
 
    Assert(errarg->origin_name);
 
    elevel = geterrlevel();
 
    /*
     * Reset the origin state to prevent the advancement of origin progress if
     * we fail to apply. Otherwise, this will result in transaction loss as
     * that transaction won't be sent again by the server.
     */
    if (elevel >= ERROR)
        replorigin_reset(0, (Datum) 0);
 
    if (errarg->rel == NULL)
    {
        if (!TransactionIdIsValid(errarg->remote_xid))
            errcontext("processing remote data for replication origin \"%s\" during message type \"%s\"",
                       errarg->origin_name,
                       logicalrep_message_type(errarg->command));
        else if (XLogRecPtrIsInvalid(errarg->finish_lsn))
            errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" in transaction %u",
                       errarg->origin_name,
                       logicalrep_message_type(errarg->command),
                       errarg->remote_xid);
        else
            errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" in transaction %u, finished at %X/%X",
                       errarg->origin_name,
                       logicalrep_message_type(errarg->command),
                       errarg->remote_xid,
                       LSN_FORMAT_ARGS(errarg->finish_lsn));
    }
    else
    {
        if (errarg->remote_attnum < 0)
        {
            if (XLogRecPtrIsInvalid(errarg->finish_lsn))
                errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" for replication target relation \"%s.%s\" in transaction %u",
                           errarg->origin_name,
                           logicalrep_message_type(errarg->command),
                           errarg->rel->remoterel.nspname,
                           errarg->rel->remoterel.relname,
                           errarg->remote_xid);
            else
                errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" for replication target relation \"%s.%s\" in transaction %u, finished at %X/%X",
                           errarg->origin_name,
                           logicalrep_message_type(errarg->command),
                           errarg->rel->remoterel.nspname,
                           errarg->rel->remoterel.relname,
                           errarg->remote_xid,
                           LSN_FORMAT_ARGS(errarg->finish_lsn));
        }
        else
        {
            if (XLogRecPtrIsInvalid(errarg->finish_lsn))
                errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" for replication target relation \"%s.%s\" column \"%s\" in transaction %u",
                           errarg->origin_name,
                           logicalrep_message_type(errarg->command),
                           errarg->rel->remoterel.nspname,
                           errarg->rel->remoterel.relname,
                           errarg->rel->remoterel.attnames[errarg->remote_attnum],
                           errarg->remote_xid);
            else
                errcontext("processing remote data for replication origin \"%s\" during message type \"%s\" for replication target relation \"%s.%s\" column \"%s\" in transaction %u, finished at %X/%X",
                           errarg->origin_name,
                           logicalrep_message_type(errarg->command),
                           errarg->rel->remoterel.nspname,
                           errarg->rel->remoterel.relname,
                           errarg->rel->remoterel.attnames[errarg->remote_attnum],
                           errarg->remote_xid,
                           LSN_FORMAT_ARGS(errarg->finish_lsn));
        }
    }
}

References apply_error_callback_arg, Assert, LogicalRepRelation::attnames, ApplyErrorCallbackArg::command, errcontext, ERROR, ApplyErrorCallbackArg::finish_lsn, geterrlevel(), logicalrep_message_type(), LSN_FORMAT_ARGS, LogicalRepRelation::nspname, ApplyErrorCallbackArg::origin_name, ApplyErrorCallbackArg::rel, LogicalRepRelation::relname, ApplyErrorCallbackArg::remote_attnum, ApplyErrorCallbackArg::remote_xid, LogicalRepRelMapEntry::remoterel, replorigin_reset(), TransactionIdIsValid, and XLogRecPtrIsInvalid.

Referenced by LogicalParallelApplyLoop(), and LogicalRepApplyLoop().

apply_handle_begin()

static void apply_handle_begin ( StringInfo  s )

static

Definition at line 989 of file worker.c.

{
    LogicalRepBeginData begin_data;
 
    /* There must not be an active streaming transaction. */
    Assert(!TransactionIdIsValid(stream_xid));
 
    logicalrep_read_begin(s, &begin_data);
    set_apply_error_context_xact(begin_data.xid, begin_data.final_lsn);
 
    remote_final_lsn = begin_data.final_lsn;
 
    maybe_start_skipping_changes(begin_data.final_lsn);
 
    in_remote_transaction = true;
 
    pgstat_report_activity(STATE_RUNNING, NULL);
}

References Assert, LogicalRepBeginData::final_lsn, in_remote_transaction, logicalrep_read_begin(), maybe_start_skipping_changes(), pgstat_report_activity(), remote_final_lsn, set_apply_error_context_xact(), STATE_RUNNING, stream_xid, TransactionIdIsValid, and LogicalRepBeginData::xid.

Referenced by apply_dispatch().

apply_handle_begin_prepare()

static void apply_handle_begin_prepare ( StringInfo  s )

static

Definition at line 1040 of file worker.c.

{
    LogicalRepPreparedTxnData begin_data;
 
    /* Tablesync should never receive prepare. */
    if (am_tablesync_worker())
        ereport(ERROR,
                (errcode(ERRCODE_PROTOCOL_VIOLATION),
                 errmsg_internal("tablesync worker received a BEGIN PREPARE message")));
 
    /* There must not be an active streaming transaction. */
    Assert(!TransactionIdIsValid(stream_xid));
 
    logicalrep_read_begin_prepare(s, &begin_data);
    set_apply_error_context_xact(begin_data.xid, begin_data.prepare_lsn);
 
    remote_final_lsn = begin_data.prepare_lsn;
 
    maybe_start_skipping_changes(begin_data.prepare_lsn);
 
    in_remote_transaction = true;
 
    pgstat_report_activity(STATE_RUNNING, NULL);
}

References am_tablesync_worker(), Assert, ereport, errcode(), errmsg_internal(), ERROR, in_remote_transaction, logicalrep_read_begin_prepare(), maybe_start_skipping_changes(), pgstat_report_activity(), LogicalRepPreparedTxnData::prepare_lsn, remote_final_lsn, set_apply_error_context_xact(), STATE_RUNNING, stream_xid, TransactionIdIsValid, and LogicalRepPreparedTxnData::xid.

Referenced by apply_dispatch().

apply_handle_commit()

static void apply_handle_commit ( StringInfo  s )

static

Definition at line 1014 of file worker.c.

{
    LogicalRepCommitData commit_data;
 
    logicalrep_read_commit(s, &commit_data);
 
    if (commit_data.commit_lsn != remote_final_lsn)
        ereport(ERROR,
                (errcode(ERRCODE_PROTOCOL_VIOLATION),
                 errmsg_internal("incorrect commit LSN %X/%X in commit message (expected %X/%X)",
                                 LSN_FORMAT_ARGS(commit_data.commit_lsn),
                                 LSN_FORMAT_ARGS(remote_final_lsn))));
 
    apply_handle_commit_internal(&commit_data);
 
    /* Process any tables that are being synchronized in parallel. */
    process_syncing_tables(commit_data.end_lsn);
 
    pgstat_report_activity(STATE_IDLE, NULL);
    reset_apply_error_context_info();
}

References apply_handle_commit_internal(), LogicalRepCommitData::commit_lsn, LogicalRepCommitData::end_lsn, ereport, errcode(), errmsg_internal(), ERROR, logicalrep_read_commit(), LSN_FORMAT_ARGS, pgstat_report_activity(), process_syncing_tables(), remote_final_lsn, reset_apply_error_context_info(), and STATE_IDLE.

Referenced by apply_dispatch().

apply_handle_commit_internal()

static void apply_handle_commit_internal ( LogicalRepCommitData *  commit_data )

static

Definition at line 2262 of file worker.c.

{
    if (is_skipping_changes())
    {
        stop_skipping_changes();
 
        /*
         * Start a new transaction to clear the subskiplsn, if not started
         * yet.
         */
        if (!IsTransactionState())
            StartTransactionCommand();
    }
 
    if (IsTransactionState())
    {
        /*
         * The transaction is either non-empty or skipped, so we clear the
         * subskiplsn.
         */
        clear_subscription_skip_lsn(commit_data->commit_lsn);
 
        /*
         * Update origin state so we can restart streaming from correct
         * position in case of crash.
         */
        replorigin_session_origin_lsn = commit_data->end_lsn;
        replorigin_session_origin_timestamp = commit_data->committime;
 
        CommitTransactionCommand();
 
        if (IsTransactionBlock())
        {
            EndTransactionBlock(false);
            CommitTransactionCommand();
        }
 
        pgstat_report_stat(false);
 
        store_flush_position(commit_data->end_lsn, XactLastCommitEnd);
    }
    else
    {
        /* Process any invalidation messages that might have accumulated. */
        AcceptInvalidationMessages();
        maybe_reread_subscription();
    }
 
    in_remote_transaction = false;
}

References AcceptInvalidationMessages(), clear_subscription_skip_lsn(), LogicalRepCommitData::commit_lsn, LogicalRepCommitData::committime, CommitTransactionCommand(), LogicalRepCommitData::end_lsn, EndTransactionBlock(), in_remote_transaction, is_skipping_changes, IsTransactionBlock(), IsTransactionState(), maybe_reread_subscription(), pgstat_report_stat(), replorigin_session_origin_lsn, replorigin_session_origin_timestamp, StartTransactionCommand(), stop_skipping_changes(), store_flush_position(), and XactLastCommitEnd.

Referenced by apply_handle_commit(), and apply_handle_stream_commit().

apply_handle_commit_prepared()

static void apply_handle_commit_prepared ( StringInfo  s )

static

Definition at line 1177 of file worker.c.

{
    LogicalRepCommitPreparedTxnData prepare_data;
    char        gid[GIDSIZE];
 
    logicalrep_read_commit_prepared(s, &prepare_data);
    set_apply_error_context_xact(prepare_data.xid, prepare_data.commit_lsn);
 
    /* Compute GID for two_phase transactions. */
    TwoPhaseTransactionGid(MySubscription->oid, prepare_data.xid,
                           gid, sizeof(gid));
 
    /* There is no transaction when COMMIT PREPARED is called */
    begin_replication_step();
 
    /*
     * Update origin state so we can restart streaming from correct position
     * in case of crash.
     */
    replorigin_session_origin_lsn = prepare_data.end_lsn;
    replorigin_session_origin_timestamp = prepare_data.commit_time;
 
    FinishPreparedTransaction(gid, true);
    end_replication_step();
    CommitTransactionCommand();
    pgstat_report_stat(false);
 
    store_flush_position(prepare_data.end_lsn, XactLastCommitEnd);
    in_remote_transaction = false;
 
    /* Process any tables that are being synchronized in parallel. */
    process_syncing_tables(prepare_data.end_lsn);
 
    clear_subscription_skip_lsn(prepare_data.end_lsn);
 
    pgstat_report_activity(STATE_IDLE, NULL);
    reset_apply_error_context_info();
}

References begin_replication_step(), clear_subscription_skip_lsn(), LogicalRepCommitPreparedTxnData::commit_lsn, LogicalRepCommitPreparedTxnData::commit_time, CommitTransactionCommand(), LogicalRepCommitPreparedTxnData::end_lsn, end_replication_step(), FinishPreparedTransaction(), GIDSIZE, in_remote_transaction, logicalrep_read_commit_prepared(), MySubscription, Subscription::oid, pgstat_report_activity(), pgstat_report_stat(), process_syncing_tables(), replorigin_session_origin_lsn, replorigin_session_origin_timestamp, reset_apply_error_context_info(), set_apply_error_context_xact(), STATE_IDLE, store_flush_position(), TwoPhaseTransactionGid(), XactLastCommitEnd, and LogicalRepCommitPreparedTxnData::xid.

Referenced by apply_dispatch().

apply_handle_delete()

static void apply_handle_delete ( StringInfo  s )

static

Definition at line 2752 of file worker.c.

{
    LogicalRepRelMapEntry *rel;
    LogicalRepTupleData oldtup;
    LogicalRepRelId relid;
    UserContext ucxt;
    ApplyExecutionData *edata;
    EState     *estate;
    TupleTableSlot *remoteslot;
    MemoryContext oldctx;
    bool        run_as_owner;
 
    /*
     * Quick return if we are skipping data modification changes or handling
     * streamed transactions.
     */
    if (is_skipping_changes() ||
        handle_streamed_transaction(LOGICAL_REP_MSG_DELETE, s))
        return;
 
    begin_replication_step();
 
    relid = logicalrep_read_delete(s, &oldtup);
    rel = logicalrep_rel_open(relid, RowExclusiveLock);
    if (!should_apply_changes_for_rel(rel))
    {
        /*
         * The relation can't become interesting in the middle of the
         * transaction so it's safe to unlock it.
         */
        logicalrep_rel_close(rel, RowExclusiveLock);
        end_replication_step();
        return;
    }
 
    /* Set relation for error callback */
    apply_error_callback_arg.rel = rel;
 
    /* Check if we can do the delete. */
    check_relation_updatable(rel);
 
    /*
     * Make sure that any user-supplied code runs as the table owner, unless
     * the user has opted out of that behavior.
     */
    run_as_owner = MySubscription->runasowner;
    if (!run_as_owner)
        SwitchToUntrustedUser(rel->localrel->rd_rel->relowner, &ucxt);
 
    /* Initialize the executor state. */
    edata = create_edata_for_relation(rel);
    estate = edata->estate;
    remoteslot = ExecInitExtraTupleSlot(estate,
                                        RelationGetDescr(rel->localrel),
                                        &TTSOpsVirtual);
 
    /* Build the search tuple. */
    oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
    slot_store_data(remoteslot, rel, &oldtup);
    MemoryContextSwitchTo(oldctx);
 
    /* For a partitioned table, apply delete to correct partition. */
    if (rel->localrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
        apply_handle_tuple_routing(edata,
                                   remoteslot, NULL, CMD_DELETE);
    else
        apply_handle_delete_internal(edata, edata->targetRelInfo,
                                     remoteslot, rel->localindexoid);
 
    finish_edata(edata);
 
    /* Reset relation for error callback */
    apply_error_callback_arg.rel = NULL;
 
    if (!run_as_owner)
        RestoreUserContext(&ucxt);
 
    logicalrep_rel_close(rel, NoLock);
 
    end_replication_step();
}

References apply_error_callback_arg, apply_handle_delete_internal(), apply_handle_tuple_routing(), begin_replication_step(), check_relation_updatable(), CMD_DELETE, create_edata_for_relation(), end_replication_step(), ApplyExecutionData::estate, ExecInitExtraTupleSlot(), finish_edata(), GetPerTupleMemoryContext, handle_streamed_transaction(), is_skipping_changes, LogicalRepRelMapEntry::localindexoid, LogicalRepRelMapEntry::localrel, LOGICAL_REP_MSG_DELETE, logicalrep_read_delete(), logicalrep_rel_close(), logicalrep_rel_open(), MemoryContextSwitchTo(), MySubscription, NoLock, RelationData::rd_rel, ApplyErrorCallbackArg::rel, RelationGetDescr, RestoreUserContext(), RowExclusiveLock, Subscription::runasowner, should_apply_changes_for_rel(), slot_store_data(), SwitchToUntrustedUser(), ApplyExecutionData::targetRelInfo, and TTSOpsVirtual.

Referenced by apply_dispatch().

apply_handle_delete_internal()

static void apply_handle_delete_internal ( ApplyExecutionData *  edata, ResultRelInfo *  relinfo, TupleTableSlot *  remoteslot, Oid  localindexoid  )

static

Definition at line 2840 of file worker.c.

{
    EState     *estate = edata->estate;
    Relation    localrel = relinfo->ri_RelationDesc;
    LogicalRepRelation *remoterel = &edata->targetRel->remoterel;
    EPQState    epqstate;
    TupleTableSlot *localslot;
    bool        found;
 
    EvalPlanQualInit(&epqstate, estate, NULL, NIL, -1, NIL);
    ExecOpenIndices(relinfo, false);
 
    found = FindReplTupleInLocalRel(edata, localrel, remoterel, localindexoid,
                                    remoteslot, &localslot);
 
    /* If found delete it. */
    if (found)
    {
        RepOriginId localorigin;
        TransactionId localxmin;
        TimestampTz localts;
 
        /*
         * Report the conflict if the tuple was modified by a different
         * origin.
         */
        if (GetTupleTransactionInfo(localslot, &localxmin, &localorigin, &localts) &&
            localorigin != replorigin_session_origin)
            ReportApplyConflict(estate, relinfo, LOG, CT_DELETE_ORIGIN_DIFFERS,
                                remoteslot, localslot, NULL,
                                InvalidOid, localxmin, localorigin, localts);
 
        EvalPlanQualSetSlot(&epqstate, localslot);
 
        /* Do the actual delete. */
        TargetPrivilegesCheck(relinfo->ri_RelationDesc, ACL_DELETE);
        ExecSimpleRelationDelete(relinfo, estate, &epqstate, localslot);
    }
    else
    {
        /*
         * The tuple to be deleted could not be found.  Do nothing except for
         * emitting a log message.
         */
        ReportApplyConflict(estate, relinfo, LOG, CT_DELETE_MISSING,
                            remoteslot, NULL, NULL,
                            InvalidOid, InvalidTransactionId,
                            InvalidRepOriginId, 0);
    }
 
    /* Cleanup. */
    ExecCloseIndices(relinfo);
    EvalPlanQualEnd(&epqstate);
}

References ACL_DELETE, CT_DELETE_MISSING, CT_DELETE_ORIGIN_DIFFERS, ApplyExecutionData::estate, EvalPlanQualEnd(), EvalPlanQualInit(), EvalPlanQualSetSlot, ExecCloseIndices(), ExecOpenIndices(), ExecSimpleRelationDelete(), FindReplTupleInLocalRel(), GetTupleTransactionInfo(), InvalidOid, InvalidRepOriginId, InvalidTransactionId, LOG, NIL, LogicalRepRelMapEntry::remoterel, replorigin_session_origin, ReportApplyConflict(), ResultRelInfo::ri_RelationDesc, TargetPrivilegesCheck(), and ApplyExecutionData::targetRel.

Referenced by apply_handle_delete(), and apply_handle_tuple_routing().

apply_handle_insert()

static void apply_handle_insert ( StringInfo  s )

static

Definition at line 2392 of file worker.c.

{
    LogicalRepRelMapEntry *rel;
    LogicalRepTupleData newtup;
    LogicalRepRelId relid;
    UserContext ucxt;
    ApplyExecutionData *edata;
    EState     *estate;
    TupleTableSlot *remoteslot;
    MemoryContext oldctx;
    bool        run_as_owner;
 
    /*
     * Quick return if we are skipping data modification changes or handling
     * streamed transactions.
     */
    if (is_skipping_changes() ||
        handle_streamed_transaction(LOGICAL_REP_MSG_INSERT, s))
        return;
 
    begin_replication_step();
 
    relid = logicalrep_read_insert(s, &newtup);
    rel = logicalrep_rel_open(relid, RowExclusiveLock);
    if (!should_apply_changes_for_rel(rel))
    {
        /*
         * The relation can't become interesting in the middle of the
         * transaction so it's safe to unlock it.
         */
        logicalrep_rel_close(rel, RowExclusiveLock);
        end_replication_step();
        return;
    }
 
    /*
     * Make sure that any user-supplied code runs as the table owner, unless
     * the user has opted out of that behavior.
     */
    run_as_owner = MySubscription->runasowner;
    if (!run_as_owner)
        SwitchToUntrustedUser(rel->localrel->rd_rel->relowner, &ucxt);
 
    /* Set relation for error callback */
    apply_error_callback_arg.rel = rel;
 
    /* Initialize the executor state. */
    edata = create_edata_for_relation(rel);
    estate = edata->estate;
    remoteslot = ExecInitExtraTupleSlot(estate,
                                        RelationGetDescr(rel->localrel),
                                        &TTSOpsVirtual);
 
    /* Process and store remote tuple in the slot */
    oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
    slot_store_data(remoteslot, rel, &newtup);
    slot_fill_defaults(rel, estate, remoteslot);
    MemoryContextSwitchTo(oldctx);
 
    /* For a partitioned table, insert the tuple into a partition. */
    if (rel->localrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
        apply_handle_tuple_routing(edata,
                                   remoteslot, NULL, CMD_INSERT);
    else
        apply_handle_insert_internal(edata, edata->targetRelInfo,
                                     remoteslot);
 
    finish_edata(edata);
 
    /* Reset relation for error callback */
    apply_error_callback_arg.rel = NULL;
 
    if (!run_as_owner)
        RestoreUserContext(&ucxt);
 
    logicalrep_rel_close(rel, NoLock);
 
    end_replication_step();
}

References apply_error_callback_arg, apply_handle_insert_internal(), apply_handle_tuple_routing(), begin_replication_step(), CMD_INSERT, create_edata_for_relation(), end_replication_step(), ApplyExecutionData::estate, ExecInitExtraTupleSlot(), finish_edata(), GetPerTupleMemoryContext, handle_streamed_transaction(), is_skipping_changes, LogicalRepRelMapEntry::localrel, LOGICAL_REP_MSG_INSERT, logicalrep_read_insert(), logicalrep_rel_close(), logicalrep_rel_open(), MemoryContextSwitchTo(), MySubscription, NoLock, RelationData::rd_rel, ApplyErrorCallbackArg::rel, RelationGetDescr, RestoreUserContext(), RowExclusiveLock, Subscription::runasowner, should_apply_changes_for_rel(), slot_fill_defaults(), slot_store_data(), SwitchToUntrustedUser(), ApplyExecutionData::targetRelInfo, and TTSOpsVirtual.

Referenced by apply_dispatch().

apply_handle_insert_internal()

static void apply_handle_insert_internal ( ApplyExecutionData *  edata, ResultRelInfo *  relinfo, TupleTableSlot *  remoteslot  )

static

Definition at line 2478 of file worker.c.

{
    EState     *estate = edata->estate;
 
    /* We must open indexes here. */
    ExecOpenIndices(relinfo, true);
    InitConflictIndexes(relinfo);
 
    /* Do the insert. */
    TargetPrivilegesCheck(relinfo->ri_RelationDesc, ACL_INSERT);
    ExecSimpleRelationInsert(relinfo, estate, remoteslot);
 
    /* Cleanup. */
    ExecCloseIndices(relinfo);
}

References ACL_INSERT, ApplyExecutionData::estate, ExecCloseIndices(), ExecOpenIndices(), ExecSimpleRelationInsert(), InitConflictIndexes(), ResultRelInfo::ri_RelationDesc, and TargetPrivilegesCheck().

Referenced by apply_handle_insert(), and apply_handle_tuple_routing().

apply_handle_origin()

static void apply_handle_origin ( StringInfo  s )

static

Definition at line 1429 of file worker.c.

{
    /*
     * ORIGIN message can only come inside streaming transaction or inside
     * remote transaction and before any actual writes.
     */
    if (!in_streamed_transaction &&
        (!in_remote_transaction ||
         (IsTransactionState() && !am_tablesync_worker())))
        ereport(ERROR,
                (errcode(ERRCODE_PROTOCOL_VIOLATION),
                 errmsg_internal("ORIGIN message sent out of order")));
}

References am_tablesync_worker(), ereport, errcode(), errmsg_internal(), ERROR, in_remote_transaction, in_streamed_transaction, and IsTransactionState().

Referenced by apply_dispatch().

apply_handle_prepare()

static void apply_handle_prepare ( StringInfo  s )

static

Definition at line 1106 of file worker.c.

{
    LogicalRepPreparedTxnData prepare_data;
 
    logicalrep_read_prepare(s, &prepare_data);
 
    if (prepare_data.prepare_lsn != remote_final_lsn)
        ereport(ERROR,
                (errcode(ERRCODE_PROTOCOL_VIOLATION),
                 errmsg_internal("incorrect prepare LSN %X/%X in prepare message (expected %X/%X)",
                                 LSN_FORMAT_ARGS(prepare_data.prepare_lsn),
                                 LSN_FORMAT_ARGS(remote_final_lsn))));
 
    /*
     * Unlike commit, here, we always prepare the transaction even though no
     * change has happened in this transaction or all changes are skipped. It
     * is done this way because at commit prepared time, we won't know whether
     * we have skipped preparing a transaction because of those reasons.
     *
     * XXX, We can optimize such that at commit prepared time, we first check
     * whether we have prepared the transaction or not but that doesn't seem
     * worthwhile because such cases shouldn't be common.
     */
    begin_replication_step();
 
    apply_handle_prepare_internal(&prepare_data);
 
    end_replication_step();
    CommitTransactionCommand();
    pgstat_report_stat(false);
 
    /*
     * It is okay not to set the local_end LSN for the prepare because we
     * always flush the prepare record. So, we can send the acknowledgment of
     * the remote_end LSN as soon as prepare is finished.
     *
     * XXX For the sake of consistency with commit, we could have set it with
     * the LSN of prepare but as of now we don't track that value similar to
     * XactLastCommitEnd, and adding it for this purpose doesn't seems worth
     * it.
     */
    store_flush_position(prepare_data.end_lsn, InvalidXLogRecPtr);
 
    in_remote_transaction = false;
 
    /* Process any tables that are being synchronized in parallel. */
    process_syncing_tables(prepare_data.end_lsn);
 
    /*
     * Since we have already prepared the transaction, in a case where the
     * server crashes before clearing the subskiplsn, it will be left but the
     * transaction won't be resent. But that's okay because it's a rare case
     * and the subskiplsn will be cleared when finishing the next transaction.
     */
    stop_skipping_changes();
    clear_subscription_skip_lsn(prepare_data.prepare_lsn);
 
    pgstat_report_activity(STATE_IDLE, NULL);
    reset_apply_error_context_info();
}

References apply_handle_prepare_internal(), begin_replication_step(), clear_subscription_skip_lsn(), CommitTransactionCommand(), LogicalRepPreparedTxnData::end_lsn, end_replication_step(), ereport, errcode(), errmsg_internal(), ERROR, in_remote_transaction, InvalidXLogRecPtr, logicalrep_read_prepare(), LSN_FORMAT_ARGS, pgstat_report_activity(), pgstat_report_stat(), LogicalRepPreparedTxnData::prepare_lsn, process_syncing_tables(), remote_final_lsn, reset_apply_error_context_info(), STATE_IDLE, stop_skipping_changes(), and store_flush_position().

Referenced by apply_dispatch().

apply_handle_prepare_internal()

static void apply_handle_prepare_internal ( LogicalRepPreparedTxnData *  prepare_data )

static

Definition at line 1069 of file worker.c.

{
    char        gid[GIDSIZE];
 
    /*
     * Compute unique GID for two_phase transactions. We don't use GID of
     * prepared transaction sent by server as that can lead to deadlock when
     * we have multiple subscriptions from same node point to publications on
     * the same node. See comments atop worker.c
     */
    TwoPhaseTransactionGid(MySubscription->oid, prepare_data->xid,
                           gid, sizeof(gid));
 
    /*
     * BeginTransactionBlock is necessary to balance the EndTransactionBlock
     * called within the PrepareTransactionBlock below.
     */
    if (!IsTransactionBlock())
    {
        BeginTransactionBlock();
        CommitTransactionCommand(); /* Completes the preceding Begin command. */
    }
 
    /*
     * Update origin state so we can restart streaming from correct position
     * in case of crash.
     */
    replorigin_session_origin_lsn = prepare_data->end_lsn;
    replorigin_session_origin_timestamp = prepare_data->prepare_time;
 
    PrepareTransactionBlock(gid);
}

References BeginTransactionBlock(), CommitTransactionCommand(), LogicalRepPreparedTxnData::end_lsn, GIDSIZE, IsTransactionBlock(), MySubscription, Subscription::oid, LogicalRepPreparedTxnData::prepare_time, PrepareTransactionBlock(), replorigin_session_origin_lsn, replorigin_session_origin_timestamp, TwoPhaseTransactionGid(), and LogicalRepPreparedTxnData::xid.

Referenced by apply_handle_prepare(), and apply_handle_stream_prepare().

apply_handle_relation()

static void apply_handle_relation ( StringInfo  s )

static

Definition at line 2322 of file worker.c.

{
    LogicalRepRelation *rel;
 
    if (handle_streamed_transaction(LOGICAL_REP_MSG_RELATION, s))
        return;
 
    rel = logicalrep_read_rel(s);
    logicalrep_relmap_update(rel);
 
    /* Also reset all entries in the partition map that refer to remoterel. */
    logicalrep_partmap_reset_relmap(rel);
}

References handle_streamed_transaction(), LOGICAL_REP_MSG_RELATION, logicalrep_partmap_reset_relmap(), logicalrep_read_rel(), and logicalrep_relmap_update().

Referenced by apply_dispatch().

apply_handle_rollback_prepared()

static void apply_handle_rollback_prepared ( StringInfo  s )

static

Definition at line 1226 of file worker.c.

{
    LogicalRepRollbackPreparedTxnData rollback_data;
    char        gid[GIDSIZE];
 
    logicalrep_read_rollback_prepared(s, &rollback_data);
    set_apply_error_context_xact(rollback_data.xid, rollback_data.rollback_end_lsn);
 
    /* Compute GID for two_phase transactions. */
    TwoPhaseTransactionGid(MySubscription->oid, rollback_data.xid,
                           gid, sizeof(gid));
 
    /*
     * It is possible that we haven't received prepare because it occurred
     * before walsender reached a consistent point or the two_phase was still
     * not enabled by that time, so in such cases, we need to skip rollback
     * prepared.
     */
    if (LookupGXact(gid, rollback_data.prepare_end_lsn,
                    rollback_data.prepare_time))
    {
        /*
         * Update origin state so we can restart streaming from correct
         * position in case of crash.
         */
        replorigin_session_origin_lsn = rollback_data.rollback_end_lsn;
        replorigin_session_origin_timestamp = rollback_data.rollback_time;
 
        /* There is no transaction when ABORT/ROLLBACK PREPARED is called */
        begin_replication_step();
        FinishPreparedTransaction(gid, false);
        end_replication_step();
        CommitTransactionCommand();
 
        clear_subscription_skip_lsn(rollback_data.rollback_end_lsn);
    }
 
    pgstat_report_stat(false);
 
    /*
     * It is okay not to set the local_end LSN for the rollback of prepared
     * transaction because we always flush the WAL record for it. See
     * apply_handle_prepare.
     */
    store_flush_position(rollback_data.rollback_end_lsn, InvalidXLogRecPtr);
    in_remote_transaction = false;
 
    /* Process any tables that are being synchronized in parallel. */
    process_syncing_tables(rollback_data.rollback_end_lsn);
 
    pgstat_report_activity(STATE_IDLE, NULL);
    reset_apply_error_context_info();
}

References begin_replication_step(), clear_subscription_skip_lsn(), CommitTransactionCommand(), end_replication_step(), FinishPreparedTransaction(), GIDSIZE, in_remote_transaction, InvalidXLogRecPtr, logicalrep_read_rollback_prepared(), LookupGXact(), MySubscription, Subscription::oid, pgstat_report_activity(), pgstat_report_stat(), LogicalRepRollbackPreparedTxnData::prepare_end_lsn, LogicalRepRollbackPreparedTxnData::prepare_time, process_syncing_tables(), replorigin_session_origin_lsn, replorigin_session_origin_timestamp, reset_apply_error_context_info(), LogicalRepRollbackPreparedTxnData::rollback_end_lsn, LogicalRepRollbackPreparedTxnData::rollback_time, set_apply_error_context_xact(), STATE_IDLE, store_flush_position(), TwoPhaseTransactionGid(), and LogicalRepRollbackPreparedTxnData::xid.

Referenced by apply_dispatch().

apply_handle_stream_abort()

static void apply_handle_stream_abort ( StringInfo  s )

static

Definition at line 1833 of file worker.c.

{
    TransactionId xid;
    TransactionId subxid;
    LogicalRepStreamAbortData abort_data;
    ParallelApplyWorkerInfo *winfo;
    TransApplyAction apply_action;
 
    /* Save the message before it is consumed. */
    StringInfoData original_msg = *s;
    bool        toplevel_xact;
 
    if (in_streamed_transaction)
        ereport(ERROR,
                (errcode(ERRCODE_PROTOCOL_VIOLATION),
                 errmsg_internal("STREAM ABORT message without STREAM STOP")));
 
    /* We receive abort information only when we can apply in parallel. */
    logicalrep_read_stream_abort(s, &abort_data,
                                 MyLogicalRepWorker->parallel_apply);
 
    xid = abort_data.xid;
    subxid = abort_data.subxid;
    toplevel_xact = (xid == subxid);
 
    set_apply_error_context_xact(subxid, abort_data.abort_lsn);
 
    apply_action = get_transaction_apply_action(xid, &winfo);
 
    switch (apply_action)
    {
        case TRANS_LEADER_APPLY:
 
            /*
             * We are in the leader apply worker and the transaction has been
             * serialized to file.
             */
            stream_abort_internal(xid, subxid);
 
            elog(DEBUG1, "finished processing the STREAM ABORT command");
            break;
 
        case TRANS_LEADER_SEND_TO_PARALLEL:
            Assert(winfo);
 
            /*
             * For the case of aborting the subtransaction, we increment the
             * number of streaming blocks and take the lock again before
             * sending the STREAM_ABORT to ensure that the parallel apply
             * worker will wait on the lock for the next set of changes after
             * processing the STREAM_ABORT message if it is not already
             * waiting for STREAM_STOP message.
             *
             * It is important to perform this locking before sending the
             * STREAM_ABORT message so that the leader can hold the lock first
             * and the parallel apply worker will wait for the leader to
             * release the lock. This is the same as what we do in
             * apply_handle_stream_stop. See Locking Considerations atop
             * applyparallelworker.c.
             */
            if (!toplevel_xact)
            {
                pa_unlock_stream(xid, AccessExclusiveLock);
                pg_atomic_add_fetch_u32(&winfo->shared->pending_stream_count, 1);
                pa_lock_stream(xid, AccessExclusiveLock);
            }
 
            if (pa_send_data(winfo, s->len, s->data))
            {
                /*
                 * Unlike STREAM_COMMIT and STREAM_PREPARE, we don't need to
                 * wait here for the parallel apply worker to finish as that
                 * is not required to maintain the commit order and won't have
                 * the risk of failures due to transaction dependencies and
                 * deadlocks. However, it is possible that before the parallel
                 * worker finishes and we clear the worker info, the xid
                 * wraparound happens on the upstream and a new transaction
                 * with the same xid can appear and that can lead to duplicate
                 * entries in ParallelApplyTxnHash. Yet another problem could
                 * be that we may have serialized the changes in partial
                 * serialize mode and the file containing xact changes may
                 * already exist, and after xid wraparound trying to create
                 * the file for the same xid can lead to an error. To avoid
                 * these problems, we decide to wait for the aborts to finish.
                 *
                 * Note, it is okay to not update the flush location position
                 * for aborts as in worst case that means such a transaction
                 * won't be sent again after restart.
                 */
                if (toplevel_xact)
                    pa_xact_finish(winfo, InvalidXLogRecPtr);
 
                break;
            }
 
            /*
             * Switch to serialize mode when we are not able to send the
             * change to parallel apply worker.
             */
            pa_switch_to_partial_serialize(winfo, true);
 
            /* fall through */
        case TRANS_LEADER_PARTIAL_SERIALIZE:
            Assert(winfo);
 
            /*
             * Parallel apply worker might have applied some changes, so write
             * the STREAM_ABORT message so that it can rollback the
             * subtransaction if needed.
             */
            stream_open_and_write_change(xid, LOGICAL_REP_MSG_STREAM_ABORT,
                                         &original_msg);
 
            if (toplevel_xact)
            {
                pa_set_fileset_state(winfo->shared, FS_SERIALIZE_DONE);
                pa_xact_finish(winfo, InvalidXLogRecPtr);
            }
            break;
 
        case TRANS_PARALLEL_APPLY:
 
            /*
             * If the parallel apply worker is applying spooled messages then
             * close the file before aborting.
             */
            if (toplevel_xact && stream_fd)
                stream_close_file();
 
            pa_stream_abort(&abort_data);
 
            /*
             * We need to wait after processing rollback to savepoint for the
             * next set of changes.
             *
             * We have a race condition here due to which we can start waiting
             * here when there are more chunk of streams in the queue. See
             * apply_handle_stream_stop.
             */
            if (!toplevel_xact)
                pa_decr_and_wait_stream_block();
 
            elog(DEBUG1, "finished processing the STREAM ABORT command");
            break;
 
        default:
            elog(ERROR, "unexpected apply action: %d", (int) apply_action);
            break;
    }
 
    reset_apply_error_context_info();
}

References LogicalRepStreamAbortData::abort_lsn, AccessExclusiveLock, Assert, StringInfoData::data, DEBUG1, elog, ereport, errcode(), errmsg_internal(), ERROR, FS_SERIALIZE_DONE, get_transaction_apply_action(), in_streamed_transaction, InvalidXLogRecPtr, StringInfoData::len, LOGICAL_REP_MSG_STREAM_ABORT, logicalrep_read_stream_abort(), MyLogicalRepWorker, pa_decr_and_wait_stream_block(), pa_lock_stream(), pa_send_data(), pa_set_fileset_state(), pa_stream_abort(), pa_switch_to_partial_serialize(), pa_unlock_stream(), pa_xact_finish(), LogicalRepWorker::parallel_apply, ParallelApplyWorkerShared::pending_stream_count, pg_atomic_add_fetch_u32(), reset_apply_error_context_info(), set_apply_error_context_xact(), ParallelApplyWorkerInfo::shared, stream_abort_internal(), stream_close_file(), stream_fd, stream_open_and_write_change(), LogicalRepStreamAbortData::subxid, TRANS_LEADER_APPLY, TRANS_LEADER_PARTIAL_SERIALIZE, TRANS_LEADER_SEND_TO_PARALLEL, TRANS_PARALLEL_APPLY, and LogicalRepStreamAbortData::xid.

Referenced by apply_dispatch().

apply_handle_stream_commit()

static void apply_handle_stream_commit ( StringInfo  s )

static

Definition at line 2152 of file worker.c.

{
    TransactionId xid;
    LogicalRepCommitData commit_data;
    ParallelApplyWorkerInfo *winfo;
    TransApplyAction apply_action;
 
    /* Save the message before it is consumed. */
    StringInfoData original_msg = *s;
 
    if (in_streamed_transaction)
        ereport(ERROR,
                (errcode(ERRCODE_PROTOCOL_VIOLATION),
                 errmsg_internal("STREAM COMMIT message without STREAM STOP")));
 
    xid = logicalrep_read_stream_commit(s, &commit_data);
    set_apply_error_context_xact(xid, commit_data.commit_lsn);
 
    apply_action = get_transaction_apply_action(xid, &winfo);
 
    switch (apply_action)
    {
        case TRANS_LEADER_APPLY:
 
            /*
             * The transaction has been serialized to file, so replay all the
             * spooled operations.
             */
            apply_spooled_messages(MyLogicalRepWorker->stream_fileset, xid,
                                   commit_data.commit_lsn);
 
            apply_handle_commit_internal(&commit_data);
 
            /* Unlink the files with serialized changes and subxact info. */
            stream_cleanup_files(MyLogicalRepWorker->subid, xid);
 
            elog(DEBUG1, "finished processing the STREAM COMMIT command");
            break;
 
        case TRANS_LEADER_SEND_TO_PARALLEL:
            Assert(winfo);
 
            if (pa_send_data(winfo, s->len, s->data))
            {
                /* Finish processing the streaming transaction. */
                pa_xact_finish(winfo, commit_data.end_lsn);
                break;
            }
 
            /*
             * Switch to serialize mode when we are not able to send the
             * change to parallel apply worker.
             */
            pa_switch_to_partial_serialize(winfo, true);
 
            /* fall through */
        case TRANS_LEADER_PARTIAL_SERIALIZE:
            Assert(winfo);
 
            stream_open_and_write_change(xid, LOGICAL_REP_MSG_STREAM_COMMIT,
                                         &original_msg);
 
            pa_set_fileset_state(winfo->shared, FS_SERIALIZE_DONE);
 
            /* Finish processing the streaming transaction. */
            pa_xact_finish(winfo, commit_data.end_lsn);
            break;
 
        case TRANS_PARALLEL_APPLY:
 
            /*
             * If the parallel apply worker is applying spooled messages then
             * close the file before committing.
             */
            if (stream_fd)
                stream_close_file();
 
            apply_handle_commit_internal(&commit_data);
 
            MyParallelShared->last_commit_end = XactLastCommitEnd;
 
            /*
             * It is important to set the transaction state as finished before
             * releasing the lock. See pa_wait_for_xact_finish.
             */
            pa_set_xact_state(MyParallelShared, PARALLEL_TRANS_FINISHED);
            pa_unlock_transaction(xid, AccessExclusiveLock);
 
            pa_reset_subtrans();
 
            elog(DEBUG1, "finished processing the STREAM COMMIT command");
            break;
 
        default:
            elog(ERROR, "unexpected apply action: %d", (int) apply_action);
            break;
    }
 
    /* Process any tables that are being synchronized in parallel. */
    process_syncing_tables(commit_data.end_lsn);
 
    pgstat_report_activity(STATE_IDLE, NULL);
 
    reset_apply_error_context_info();
}

References AccessExclusiveLock, apply_handle_commit_internal(), apply_spooled_messages(), Assert, LogicalRepCommitData::commit_lsn, StringInfoData::data, DEBUG1, elog, LogicalRepCommitData::end_lsn, ereport, errcode(), errmsg_internal(), ERROR, FS_SERIALIZE_DONE, get_transaction_apply_action(), in_streamed_transaction, ParallelApplyWorkerShared::last_commit_end, StringInfoData::len, LOGICAL_REP_MSG_STREAM_COMMIT, logicalrep_read_stream_commit(), MyLogicalRepWorker, MyParallelShared, pa_reset_subtrans(), pa_send_data(), pa_set_fileset_state(), pa_set_xact_state(), pa_switch_to_partial_serialize(), pa_unlock_transaction(), pa_xact_finish(), PARALLEL_TRANS_FINISHED, pgstat_report_activity(), process_syncing_tables(), reset_apply_error_context_info(), set_apply_error_context_xact(), ParallelApplyWorkerInfo::shared, STATE_IDLE, stream_cleanup_files(), stream_close_file(), stream_fd, LogicalRepWorker::stream_fileset, stream_open_and_write_change(), LogicalRepWorker::subid, TRANS_LEADER_APPLY, TRANS_LEADER_PARTIAL_SERIALIZE, TRANS_LEADER_SEND_TO_PARALLEL, TRANS_PARALLEL_APPLY, and XactLastCommitEnd.

Referenced by apply_dispatch().

apply_handle_stream_prepare()

static void apply_handle_stream_prepare ( StringInfo  s )

static

Definition at line 1284 of file worker.c.

{
    LogicalRepPreparedTxnData prepare_data;
    ParallelApplyWorkerInfo *winfo;
    TransApplyAction apply_action;
 
    /* Save the message before it is consumed. */
    StringInfoData original_msg = *s;
 
    if (in_streamed_transaction)
        ereport(ERROR,
                (errcode(ERRCODE_PROTOCOL_VIOLATION),
                 errmsg_internal("STREAM PREPARE message without STREAM STOP")));
 
    /* Tablesync should never receive prepare. */
    if (am_tablesync_worker())
        ereport(ERROR,
                (errcode(ERRCODE_PROTOCOL_VIOLATION),
                 errmsg_internal("tablesync worker received a STREAM PREPARE message")));
 
    logicalrep_read_stream_prepare(s, &prepare_data);
    set_apply_error_context_xact(prepare_data.xid, prepare_data.prepare_lsn);
 
    apply_action = get_transaction_apply_action(prepare_data.xid, &winfo);
 
    switch (apply_action)
    {
        case TRANS_LEADER_APPLY:
 
            /*
             * The transaction has been serialized to file, so replay all the
             * spooled operations.
             */
            apply_spooled_messages(MyLogicalRepWorker->stream_fileset,
                                   prepare_data.xid, prepare_data.prepare_lsn);
 
            /* Mark the transaction as prepared. */
            apply_handle_prepare_internal(&prepare_data);
 
            CommitTransactionCommand();
 
            /*
             * It is okay not to set the local_end LSN for the prepare because
             * we always flush the prepare record. See apply_handle_prepare.
             */
            store_flush_position(prepare_data.end_lsn, InvalidXLogRecPtr);
 
            in_remote_transaction = false;
 
            /* Unlink the files with serialized changes and subxact info. */
            stream_cleanup_files(MyLogicalRepWorker->subid, prepare_data.xid);
 
            elog(DEBUG1, "finished processing the STREAM PREPARE command");
            break;
 
        case TRANS_LEADER_SEND_TO_PARALLEL:
            Assert(winfo);
 
            if (pa_send_data(winfo, s->len, s->data))
            {
                /* Finish processing the streaming transaction. */
                pa_xact_finish(winfo, prepare_data.end_lsn);
                break;
            }
 
            /*
             * Switch to serialize mode when we are not able to send the
             * change to parallel apply worker.
             */
            pa_switch_to_partial_serialize(winfo, true);
 
            /* fall through */
        case TRANS_LEADER_PARTIAL_SERIALIZE:
            Assert(winfo);
 
            stream_open_and_write_change(prepare_data.xid,
                                         LOGICAL_REP_MSG_STREAM_PREPARE,
                                         &original_msg);
 
            pa_set_fileset_state(winfo->shared, FS_SERIALIZE_DONE);
 
            /* Finish processing the streaming transaction. */
            pa_xact_finish(winfo, prepare_data.end_lsn);
            break;
 
        case TRANS_PARALLEL_APPLY:
 
            /*
             * If the parallel apply worker is applying spooled messages then
             * close the file before preparing.
             */
            if (stream_fd)
                stream_close_file();
 
            begin_replication_step();
 
            /* Mark the transaction as prepared. */
            apply_handle_prepare_internal(&prepare_data);
 
            end_replication_step();
 
            CommitTransactionCommand();
 
            /*
             * It is okay not to set the local_end LSN for the prepare because
             * we always flush the prepare record. See apply_handle_prepare.
             */
            MyParallelShared->last_commit_end = InvalidXLogRecPtr;
 
            pa_set_xact_state(MyParallelShared, PARALLEL_TRANS_FINISHED);
            pa_unlock_transaction(MyParallelShared->xid, AccessExclusiveLock);
 
            pa_reset_subtrans();
 
            elog(DEBUG1, "finished processing the STREAM PREPARE command");
            break;
 
        default:
            elog(ERROR, "unexpected apply action: %d", (int) apply_action);
            break;
    }
 
    pgstat_report_stat(false);
 
    /* Process any tables that are being synchronized in parallel. */
    process_syncing_tables(prepare_data.end_lsn);
 
    /*
     * Similar to prepare case, the subskiplsn could be left in a case of
     * server crash but it's okay. See the comments in apply_handle_prepare().
     */
    stop_skipping_changes();
    clear_subscription_skip_lsn(prepare_data.prepare_lsn);
 
    pgstat_report_activity(STATE_IDLE, NULL);
 
    reset_apply_error_context_info();
}

References AccessExclusiveLock, am_tablesync_worker(), apply_handle_prepare_internal(), apply_spooled_messages(), Assert, begin_replication_step(), clear_subscription_skip_lsn(), CommitTransactionCommand(), StringInfoData::data, DEBUG1, elog, LogicalRepPreparedTxnData::end_lsn, end_replication_step(), ereport, errcode(), errmsg_internal(), ERROR, FS_SERIALIZE_DONE, get_transaction_apply_action(), in_remote_transaction, in_streamed_transaction, InvalidXLogRecPtr, ParallelApplyWorkerShared::last_commit_end, StringInfoData::len, LOGICAL_REP_MSG_STREAM_PREPARE, logicalrep_read_stream_prepare(), MyLogicalRepWorker, MyParallelShared, pa_reset_subtrans(), pa_send_data(), pa_set_fileset_state(), pa_set_xact_state(), pa_switch_to_partial_serialize(), pa_unlock_transaction(), pa_xact_finish(), PARALLEL_TRANS_FINISHED, pgstat_report_activity(), pgstat_report_stat(), LogicalRepPreparedTxnData::prepare_lsn, process_syncing_tables(), reset_apply_error_context_info(), set_apply_error_context_xact(), ParallelApplyWorkerInfo::shared, STATE_IDLE, stop_skipping_changes(), store_flush_position(), stream_cleanup_files(), stream_close_file(), stream_fd, LogicalRepWorker::stream_fileset, stream_open_and_write_change(), LogicalRepWorker::subid, TRANS_LEADER_APPLY, TRANS_LEADER_PARTIAL_SERIALIZE, TRANS_LEADER_SEND_TO_PARALLEL, TRANS_PARALLEL_APPLY, LogicalRepPreparedTxnData::xid, and ParallelApplyWorkerShared::xid.

Referenced by apply_dispatch().

apply_handle_stream_start()

static void apply_handle_stream_start ( StringInfo  s )

static

Definition at line 1488 of file worker.c.

{
    bool        first_segment;
    ParallelApplyWorkerInfo *winfo;
    TransApplyAction apply_action;
 
    /* Save the message before it is consumed. */
    StringInfoData original_msg = *s;
 
    if (in_streamed_transaction)
        ereport(ERROR,
                (errcode(ERRCODE_PROTOCOL_VIOLATION),
                 errmsg_internal("duplicate STREAM START message")));
 
    /* There must not be an active streaming transaction. */
    Assert(!TransactionIdIsValid(stream_xid));
 
    /* notify handle methods we're processing a remote transaction */
    in_streamed_transaction = true;
 
    /* extract XID of the top-level transaction */
    stream_xid = logicalrep_read_stream_start(s, &first_segment);
 
    if (!TransactionIdIsValid(stream_xid))
        ereport(ERROR,
                (errcode(ERRCODE_PROTOCOL_VIOLATION),
                 errmsg_internal("invalid transaction ID in streamed replication transaction")));
 
    set_apply_error_context_xact(stream_xid, InvalidXLogRecPtr);
 
    /* Try to allocate a worker for the streaming transaction. */
    if (first_segment)
        pa_allocate_worker(stream_xid);
 
    apply_action = get_transaction_apply_action(stream_xid, &winfo);
 
    switch (apply_action)
    {
        case TRANS_LEADER_SERIALIZE:
 
            /*
             * Function stream_start_internal starts a transaction. This
             * transaction will be committed on the stream stop unless it is a
             * tablesync worker in which case it will be committed after
             * processing all the messages. We need this transaction for
             * handling the BufFile, used for serializing the streaming data
             * and subxact info.
             */
            stream_start_internal(stream_xid, first_segment);
            break;
 
        case TRANS_LEADER_SEND_TO_PARALLEL:
            Assert(winfo);
 
            /*
             * Once we start serializing the changes, the parallel apply
             * worker will wait for the leader to release the stream lock
             * until the end of the transaction. So, we don't need to release
             * the lock or increment the stream count in that case.
             */
            if (pa_send_data(winfo, s->len, s->data))
            {
                /*
                 * Unlock the shared object lock so that the parallel apply
                 * worker can continue to receive changes.
                 */
                if (!first_segment)
                    pa_unlock_stream(winfo->shared->xid, AccessExclusiveLock);
 
                /*
                 * Increment the number of streaming blocks waiting to be
                 * processed by parallel apply worker.
                 */
                pg_atomic_add_fetch_u32(&winfo->shared->pending_stream_count, 1);
 
                /* Cache the parallel apply worker for this transaction. */
                pa_set_stream_apply_worker(winfo);
                break;
            }
 
            /*
             * Switch to serialize mode when we are not able to send the
             * change to parallel apply worker.
             */
            pa_switch_to_partial_serialize(winfo, !first_segment);
 
            /* fall through */
        case TRANS_LEADER_PARTIAL_SERIALIZE:
            Assert(winfo);
 
            /*
             * Open the spool file unless it was already opened when switching
             * to serialize mode. The transaction started in
             * stream_start_internal will be committed on the stream stop.
             */
            if (apply_action != TRANS_LEADER_SEND_TO_PARALLEL)
                stream_start_internal(stream_xid, first_segment);
 
            stream_write_change(LOGICAL_REP_MSG_STREAM_START, &original_msg);
 
            /* Cache the parallel apply worker for this transaction. */
            pa_set_stream_apply_worker(winfo);
            break;
 
        case TRANS_PARALLEL_APPLY:
            if (first_segment)
            {
                /* Hold the lock until the end of the transaction. */
                pa_lock_transaction(MyParallelShared->xid, AccessExclusiveLock);
                pa_set_xact_state(MyParallelShared, PARALLEL_TRANS_STARTED);
 
                /*
                 * Signal the leader apply worker, as it may be waiting for
                 * us.
                 */
                logicalrep_worker_wakeup(MyLogicalRepWorker->subid, InvalidOid);
            }
 
            parallel_stream_nchanges = 0;
            break;
 
        default:
            elog(ERROR, "unexpected apply action: %d", (int) apply_action);
            break;
    }
 
    pgstat_report_activity(STATE_RUNNING, NULL);
}

References AccessExclusiveLock, Assert, StringInfoData::data, elog, ereport, errcode(), errmsg_internal(), ERROR, get_transaction_apply_action(), in_streamed_transaction, InvalidOid, InvalidXLogRecPtr, StringInfoData::len, LOGICAL_REP_MSG_STREAM_START, logicalrep_read_stream_start(), logicalrep_worker_wakeup(), MyLogicalRepWorker, MyParallelShared, pa_allocate_worker(), pa_lock_transaction(), pa_send_data(), pa_set_stream_apply_worker(), pa_set_xact_state(), pa_switch_to_partial_serialize(), pa_unlock_stream(), parallel_stream_nchanges, PARALLEL_TRANS_STARTED, ParallelApplyWorkerShared::pending_stream_count, pg_atomic_add_fetch_u32(), pgstat_report_activity(), set_apply_error_context_xact(), ParallelApplyWorkerInfo::shared, STATE_RUNNING, stream_start_internal(), stream_write_change(), stream_xid, LogicalRepWorker::subid, TRANS_LEADER_PARTIAL_SERIALIZE, TRANS_LEADER_SEND_TO_PARALLEL, TRANS_LEADER_SERIALIZE, TRANS_PARALLEL_APPLY, TransactionIdIsValid, and ParallelApplyWorkerShared::xid.

Referenced by apply_dispatch().

apply_handle_stream_stop()

static void apply_handle_stream_stop ( StringInfo  s )

static

Definition at line 1647 of file worker.c.

{
    ParallelApplyWorkerInfo *winfo;
    TransApplyAction apply_action;
 
    if (!in_streamed_transaction)
        ereport(ERROR,
                (errcode(ERRCODE_PROTOCOL_VIOLATION),
                 errmsg_internal("STREAM STOP message without STREAM START")));
 
    apply_action = get_transaction_apply_action(stream_xid, &winfo);
 
    switch (apply_action)
    {
        case TRANS_LEADER_SERIALIZE:
            stream_stop_internal(stream_xid);
            break;
 
        case TRANS_LEADER_SEND_TO_PARALLEL:
            Assert(winfo);
 
            /*
             * Lock before sending the STREAM_STOP message so that the leader
             * can hold the lock first and the parallel apply worker will wait
             * for leader to release the lock. See Locking Considerations atop
             * applyparallelworker.c.
             */
            pa_lock_stream(winfo->shared->xid, AccessExclusiveLock);
 
            if (pa_send_data(winfo, s->len, s->data))
            {
                pa_set_stream_apply_worker(NULL);
                break;
            }
 
            /*
             * Switch to serialize mode when we are not able to send the
             * change to parallel apply worker.
             */
            pa_switch_to_partial_serialize(winfo, true);
 
            /* fall through */
        case TRANS_LEADER_PARTIAL_SERIALIZE:
            stream_write_change(LOGICAL_REP_MSG_STREAM_STOP, s);
            stream_stop_internal(stream_xid);
            pa_set_stream_apply_worker(NULL);
            break;
 
        case TRANS_PARALLEL_APPLY:
            elog(DEBUG1, "applied %u changes in the streaming chunk",
                 parallel_stream_nchanges);
 
            /*
             * By the time parallel apply worker is processing the changes in
             * the current streaming block, the leader apply worker may have
             * sent multiple streaming blocks. This can lead to parallel apply
             * worker start waiting even when there are more chunk of streams
             * in the queue. So, try to lock only if there is no message left
             * in the queue. See Locking Considerations atop
             * applyparallelworker.c.
             *
             * Note that here we have a race condition where we can start
             * waiting even when there are pending streaming chunks. This can
             * happen if the leader sends another streaming block and acquires
             * the stream lock again after the parallel apply worker checks
             * that there is no pending streaming block and before it actually
             * starts waiting on a lock. We can handle this case by not
             * allowing the leader to increment the stream block count during
             * the time parallel apply worker acquires the lock but it is not
             * clear whether that is worth the complexity.
             *
             * Now, if this missed chunk contains rollback to savepoint, then
             * there is a risk of deadlock which probably shouldn't happen
             * after restart.
             */
            pa_decr_and_wait_stream_block();
            break;
 
        default:
            elog(ERROR, "unexpected apply action: %d", (int) apply_action);
            break;
    }
 
    in_streamed_transaction = false;
    stream_xid = InvalidTransactionId;
 
    /*
     * The parallel apply worker could be in a transaction in which case we
     * need to report the state as STATE_IDLEINTRANSACTION.
     */
    if (IsTransactionOrTransactionBlock())
        pgstat_report_activity(STATE_IDLEINTRANSACTION, NULL);
    else
        pgstat_report_activity(STATE_IDLE, NULL);
 
    reset_apply_error_context_info();
}

References AccessExclusiveLock, Assert, StringInfoData::data, DEBUG1, elog, ereport, errcode(), errmsg_internal(), ERROR, get_transaction_apply_action(), in_streamed_transaction, InvalidTransactionId, IsTransactionOrTransactionBlock(), StringInfoData::len, LOGICAL_REP_MSG_STREAM_STOP, pa_decr_and_wait_stream_block(), pa_lock_stream(), pa_send_data(), pa_set_stream_apply_worker(), pa_switch_to_partial_serialize(), parallel_stream_nchanges, pgstat_report_activity(), reset_apply_error_context_info(), ParallelApplyWorkerInfo::shared, STATE_IDLE, STATE_IDLEINTRANSACTION, stream_stop_internal(), stream_write_change(), stream_xid, TRANS_LEADER_PARTIAL_SERIALIZE, TRANS_LEADER_SEND_TO_PARALLEL, TRANS_LEADER_SERIALIZE, TRANS_PARALLEL_APPLY, and ParallelApplyWorkerShared::xid.

Referenced by apply_dispatch().

apply_handle_truncate()

static void apply_handle_truncate ( StringInfo  s )

static

Definition at line 3236 of file worker.c.

{
    bool        cascade = false;
    bool        restart_seqs = false;
    List       *remote_relids = NIL;
    List       *remote_rels = NIL;
    List       *rels = NIL;
    List       *part_rels = NIL;
    List       *relids = NIL;
    List       *relids_logged = NIL;
    ListCell   *lc;
    LOCKMODE    lockmode = AccessExclusiveLock;
 
    /*
     * Quick return if we are skipping data modification changes or handling
     * streamed transactions.
     */
    if (is_skipping_changes() ||
        handle_streamed_transaction(LOGICAL_REP_MSG_TRUNCATE, s))
        return;
 
    begin_replication_step();
 
    remote_relids = logicalrep_read_truncate(s, &cascade, &restart_seqs);
 
    foreach(lc, remote_relids)
    {
        LogicalRepRelId relid = lfirst_oid(lc);
        LogicalRepRelMapEntry *rel;
 
        rel = logicalrep_rel_open(relid, lockmode);
        if (!should_apply_changes_for_rel(rel))
        {
            /*
             * The relation can't become interesting in the middle of the
             * transaction so it's safe to unlock it.
             */
            logicalrep_rel_close(rel, lockmode);
            continue;
        }
 
        remote_rels = lappend(remote_rels, rel);
        TargetPrivilegesCheck(rel->localrel, ACL_TRUNCATE);
        rels = lappend(rels, rel->localrel);
        relids = lappend_oid(relids, rel->localreloid);
        if (RelationIsLogicallyLogged(rel->localrel))
            relids_logged = lappend_oid(relids_logged, rel->localreloid);
 
        /*
         * Truncate partitions if we got a message to truncate a partitioned
         * table.
         */
        if (rel->localrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
        {
            ListCell   *child;
            List       *children = find_all_inheritors(rel->localreloid,
                                                       lockmode,
                                                       NULL);
 
            foreach(child, children)
            {
                Oid         childrelid = lfirst_oid(child);
                Relation    childrel;
 
                if (list_member_oid(relids, childrelid))
                    continue;
 
                /* find_all_inheritors already got lock */
                childrel = table_open(childrelid, NoLock);
 
                /*
                 * Ignore temp tables of other backends.  See similar code in
                 * ExecuteTruncate().
                 */
                if (RELATION_IS_OTHER_TEMP(childrel))
                {
                    table_close(childrel, lockmode);
                    continue;
                }
 
                TargetPrivilegesCheck(childrel, ACL_TRUNCATE);
                rels = lappend(rels, childrel);
                part_rels = lappend(part_rels, childrel);
                relids = lappend_oid(relids, childrelid);
                /* Log this relation only if needed for logical decoding */
                if (RelationIsLogicallyLogged(childrel))
                    relids_logged = lappend_oid(relids_logged, childrelid);
            }
        }
    }
 
    /*
     * Even if we used CASCADE on the upstream primary we explicitly default
     * to replaying changes without further cascading. This might be later
     * changeable with a user specified option.
     *
     * MySubscription->runasowner tells us whether we want to execute
     * replication actions as the subscription owner; the last argument to
     * TruncateGuts tells it whether we want to switch to the table owner.
     * Those are exactly opposite conditions.
     */
    ExecuteTruncateGuts(rels,
                        relids,
                        relids_logged,
                        DROP_RESTRICT,
                        restart_seqs,
                        !MySubscription->runasowner);
    foreach(lc, remote_rels)
    {
        LogicalRepRelMapEntry *rel = lfirst(lc);
 
        logicalrep_rel_close(rel, NoLock);
    }
    foreach(lc, part_rels)
    {
        Relation    rel = lfirst(lc);
 
        table_close(rel, NoLock);
    }
 
    end_replication_step();
}

References AccessExclusiveLock, ACL_TRUNCATE, begin_replication_step(), DROP_RESTRICT, end_replication_step(), ExecuteTruncateGuts(), find_all_inheritors(), handle_streamed_transaction(), is_skipping_changes, lappend(), lappend_oid(), lfirst, lfirst_oid, list_member_oid(), LogicalRepRelMapEntry::localrel, LogicalRepRelMapEntry::localreloid, LOGICAL_REP_MSG_TRUNCATE, logicalrep_read_truncate(), logicalrep_rel_close(), logicalrep_rel_open(), MySubscription, NIL, NoLock, RelationData::rd_rel, RELATION_IS_OTHER_TEMP, RelationIsLogicallyLogged, Subscription::runasowner, should_apply_changes_for_rel(), table_close(), table_open(), and TargetPrivilegesCheck().

Referenced by apply_dispatch().

apply_handle_tuple_routing()

static void apply_handle_tuple_routing ( ApplyExecutionData *  edata, TupleTableSlot *  remoteslot, LogicalRepTupleData *  newtup, CmdType  operation  )

static

Definition at line 2954 of file worker.c.

{
    EState     *estate = edata->estate;
    LogicalRepRelMapEntry *relmapentry = edata->targetRel;
    ResultRelInfo *relinfo = edata->targetRelInfo;
    Relation    parentrel = relinfo->ri_RelationDesc;
    ModifyTableState *mtstate;
    PartitionTupleRouting *proute;
    ResultRelInfo *partrelinfo;
    Relation    partrel;
    TupleTableSlot *remoteslot_part;
    TupleConversionMap *map;
    MemoryContext oldctx;
    LogicalRepRelMapEntry *part_entry = NULL;
    AttrMap    *attrmap = NULL;
 
    /* ModifyTableState is needed for ExecFindPartition(). */
    edata->mtstate = mtstate = makeNode(ModifyTableState);
    mtstate->ps.plan = NULL;
    mtstate->ps.state = estate;
    mtstate->operation = operation;
    mtstate->resultRelInfo = relinfo;
 
    /* ... as is PartitionTupleRouting. */
    edata->proute = proute = ExecSetupPartitionTupleRouting(estate, parentrel);
 
    /*
     * Find the partition to which the "search tuple" belongs.
     */
    Assert(remoteslot != NULL);
    oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
    partrelinfo = ExecFindPartition(mtstate, relinfo, proute,
                                    remoteslot, estate);
    Assert(partrelinfo != NULL);
    partrel = partrelinfo->ri_RelationDesc;
 
    /*
     * Check for supported relkind.  We need this since partitions might be of
     * unsupported relkinds; and the set of partitions can change, so checking
     * at CREATE/ALTER SUBSCRIPTION would be insufficient.
     */
    CheckSubscriptionRelkind(partrel->rd_rel->relkind,
                             get_namespace_name(RelationGetNamespace(partrel)),
                             RelationGetRelationName(partrel));
 
    /*
     * To perform any of the operations below, the tuple must match the
     * partition's rowtype. Convert if needed or just copy, using a dedicated
     * slot to store the tuple in any case.
     */
    remoteslot_part = partrelinfo->ri_PartitionTupleSlot;
    if (remoteslot_part == NULL)
        remoteslot_part = table_slot_create(partrel, &estate->es_tupleTable);
    map = ExecGetRootToChildMap(partrelinfo, estate);
    if (map != NULL)
    {
        attrmap = map->attrMap;
        remoteslot_part = execute_attr_map_slot(attrmap, remoteslot,
                                                remoteslot_part);
    }
    else
    {
        remoteslot_part = ExecCopySlot(remoteslot_part, remoteslot);
        slot_getallattrs(remoteslot_part);
    }
    MemoryContextSwitchTo(oldctx);
 
    /* Check if we can do the update or delete on the leaf partition. */
    if (operation == CMD_UPDATE || operation == CMD_DELETE)
    {
        part_entry = logicalrep_partition_open(relmapentry, partrel,
                                               attrmap);
        check_relation_updatable(part_entry);
    }
 
    switch (operation)
    {
        case CMD_INSERT:
            apply_handle_insert_internal(edata, partrelinfo,
                                         remoteslot_part);
            break;
 
        case CMD_DELETE:
            apply_handle_delete_internal(edata, partrelinfo,
                                         remoteslot_part,
                                         part_entry->localindexoid);
            break;
 
        case CMD_UPDATE:
 
            /*
             * For UPDATE, depending on whether or not the updated tuple
             * satisfies the partition's constraint, perform a simple UPDATE
             * of the partition or move the updated tuple into a different
             * suitable partition.
             */
            {
                TupleTableSlot *localslot;
                ResultRelInfo *partrelinfo_new;
                Relation    partrel_new;
                bool        found;
                EPQState    epqstate;
                RepOriginId localorigin;
                TransactionId localxmin;
                TimestampTz localts;
 
                /* Get the matching local tuple from the partition. */
                found = FindReplTupleInLocalRel(edata, partrel,
                                                &part_entry->remoterel,
                                                part_entry->localindexoid,
                                                remoteslot_part, &localslot);
                if (!found)
                {
                    TupleTableSlot *newslot = localslot;
 
                    /* Store the new tuple for conflict reporting */
                    slot_store_data(newslot, part_entry, newtup);
 
                    /*
                     * The tuple to be updated could not be found.  Do nothing
                     * except for emitting a log message.
                     */
                    ReportApplyConflict(estate, partrelinfo,
                                        LOG, CT_UPDATE_MISSING,
                                        remoteslot_part, NULL, newslot,
                                        InvalidOid, InvalidTransactionId,
                                        InvalidRepOriginId, 0);
 
                    return;
                }
 
                /*
                 * Report the conflict if the tuple was modified by a
                 * different origin.
                 */
                if (GetTupleTransactionInfo(localslot, &localxmin, &localorigin, &localts) &&
                    localorigin != replorigin_session_origin)
                {
                    TupleTableSlot *newslot;
 
                    /* Store the new tuple for conflict reporting */
                    newslot = table_slot_create(partrel, &estate->es_tupleTable);
                    slot_store_data(newslot, part_entry, newtup);
 
                    ReportApplyConflict(estate, partrelinfo, LOG, CT_UPDATE_ORIGIN_DIFFERS,
                                        remoteslot_part, localslot, newslot,
                                        InvalidOid, localxmin, localorigin,
                                        localts);
                }
 
                /*
                 * Apply the update to the local tuple, putting the result in
                 * remoteslot_part.
                 */
                oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
                slot_modify_data(remoteslot_part, localslot, part_entry,
                                 newtup);
                MemoryContextSwitchTo(oldctx);
 
                EvalPlanQualInit(&epqstate, estate, NULL, NIL, -1, NIL);
 
                /*
                 * Does the updated tuple still satisfy the current
                 * partition's constraint?
                 */
                if (!partrel->rd_rel->relispartition ||
                    ExecPartitionCheck(partrelinfo, remoteslot_part, estate,
                                       false))
                {
                    /*
                     * Yes, so simply UPDATE the partition.  We don't call
                     * apply_handle_update_internal() here, which would
                     * normally do the following work, to avoid repeating some
                     * work already done above to find the local tuple in the
                     * partition.
                     */
                    ExecOpenIndices(partrelinfo, true);
                    InitConflictIndexes(partrelinfo);
 
                    EvalPlanQualSetSlot(&epqstate, remoteslot_part);
                    TargetPrivilegesCheck(partrelinfo->ri_RelationDesc,
                                          ACL_UPDATE);
                    ExecSimpleRelationUpdate(partrelinfo, estate, &epqstate,
                                             localslot, remoteslot_part);
                }
                else
                {
                    /* Move the tuple into the new partition. */
 
                    /*
                     * New partition will be found using tuple routing, which
                     * can only occur via the parent table.  We might need to
                     * convert the tuple to the parent's rowtype.  Note that
                     * this is the tuple found in the partition, not the
                     * original search tuple received by this function.
                     */
                    if (map)
                    {
                        TupleConversionMap *PartitionToRootMap =
                            convert_tuples_by_name(RelationGetDescr(partrel),
                                                   RelationGetDescr(parentrel));
 
                        remoteslot =
                            execute_attr_map_slot(PartitionToRootMap->attrMap,
                                                  remoteslot_part, remoteslot);
                    }
                    else
                    {
                        remoteslot = ExecCopySlot(remoteslot, remoteslot_part);
                        slot_getallattrs(remoteslot);
                    }
 
                    /* Find the new partition. */
                    oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
                    partrelinfo_new = ExecFindPartition(mtstate, relinfo,
                                                        proute, remoteslot,
                                                        estate);
                    MemoryContextSwitchTo(oldctx);
                    Assert(partrelinfo_new != partrelinfo);
                    partrel_new = partrelinfo_new->ri_RelationDesc;
 
                    /* Check that new partition also has supported relkind. */
                    CheckSubscriptionRelkind(partrel_new->rd_rel->relkind,
                                             get_namespace_name(RelationGetNamespace(partrel_new)),
                                             RelationGetRelationName(partrel_new));
 
                    ExecOpenIndices(partrelinfo, false);
 
                    /* DELETE old tuple found in the old partition. */
                    EvalPlanQualSetSlot(&epqstate, localslot);
                    TargetPrivilegesCheck(partrelinfo->ri_RelationDesc, ACL_DELETE);
                    ExecSimpleRelationDelete(partrelinfo, estate, &epqstate, localslot);
 
                    /* INSERT new tuple into the new partition. */
 
                    /*
                     * Convert the replacement tuple to match the destination
                     * partition rowtype.
                     */
                    oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
                    remoteslot_part = partrelinfo_new->ri_PartitionTupleSlot;
                    if (remoteslot_part == NULL)
                        remoteslot_part = table_slot_create(partrel_new,
                                                            &estate->es_tupleTable);
                    map = ExecGetRootToChildMap(partrelinfo_new, estate);
                    if (map != NULL)
                    {
                        remoteslot_part = execute_attr_map_slot(map->attrMap,
                                                                remoteslot,
                                                                remoteslot_part);
                    }
                    else
                    {
                        remoteslot_part = ExecCopySlot(remoteslot_part,
                                                       remoteslot);
                        slot_getallattrs(remoteslot);
                    }
                    MemoryContextSwitchTo(oldctx);
                    apply_handle_insert_internal(edata, partrelinfo_new,
                                                 remoteslot_part);
                }
 
                ExecCloseIndices(partrelinfo);
                EvalPlanQualEnd(&epqstate);
            }
            break;
 
        default:
            elog(ERROR, "unrecognized CmdType: %d", (int) operation);
            break;
    }
}

References ACL_DELETE, ACL_UPDATE, apply_handle_delete_internal(), apply_handle_insert_internal(), Assert, TupleConversionMap::attrMap, check_relation_updatable(), CheckSubscriptionRelkind(), CMD_DELETE, CMD_INSERT, CMD_UPDATE, convert_tuples_by_name(), CT_UPDATE_MISSING, CT_UPDATE_ORIGIN_DIFFERS, elog, ERROR, EState::es_tupleTable, ApplyExecutionData::estate, EvalPlanQualEnd(), EvalPlanQualInit(), EvalPlanQualSetSlot, ExecCloseIndices(), ExecCopySlot(), ExecFindPartition(), ExecGetRootToChildMap(), ExecOpenIndices(), ExecPartitionCheck(), ExecSetupPartitionTupleRouting(), ExecSimpleRelationDelete(), ExecSimpleRelationUpdate(), execute_attr_map_slot(), FindReplTupleInLocalRel(), get_namespace_name(), GetPerTupleMemoryContext, GetTupleTransactionInfo(), InitConflictIndexes(), InvalidOid, InvalidRepOriginId, InvalidTransactionId, LogicalRepRelMapEntry::localindexoid, LOG, logicalrep_partition_open(), makeNode, MemoryContextSwitchTo(), ApplyExecutionData::mtstate, NIL, ModifyTableState::operation, PlanState::plan, ApplyExecutionData::proute, ModifyTableState::ps, RelationData::rd_rel, RelationGetDescr, RelationGetNamespace, RelationGetRelationName, LogicalRepRelMapEntry::remoterel, replorigin_session_origin, ReportApplyConflict(), ModifyTableState::resultRelInfo, ResultRelInfo::ri_PartitionTupleSlot, ResultRelInfo::ri_RelationDesc, slot_getallattrs(), slot_modify_data(), slot_store_data(), PlanState::state, table_slot_create(), TargetPrivilegesCheck(), ApplyExecutionData::targetRel, and ApplyExecutionData::targetRelInfo.

Referenced by apply_handle_delete(), apply_handle_insert(), and apply_handle_update().

apply_handle_type()

static void apply_handle_type ( StringInfo  s )

static

Definition at line 2345 of file worker.c.

{
    LogicalRepTyp typ;
 
    if (handle_streamed_transaction(LOGICAL_REP_MSG_TYPE, s))
        return;
 
    logicalrep_read_typ(s, &typ);
}

References handle_streamed_transaction(), LOGICAL_REP_MSG_TYPE, and logicalrep_read_typ().

Referenced by apply_dispatch().

apply_handle_update()

static void apply_handle_update ( StringInfo  s )

static

Definition at line 2542 of file worker.c.

{
    LogicalRepRelMapEntry *rel;
    LogicalRepRelId relid;
    UserContext ucxt;
    ApplyExecutionData *edata;
    EState     *estate;
    LogicalRepTupleData oldtup;
    LogicalRepTupleData newtup;
    bool        has_oldtup;
    TupleTableSlot *remoteslot;
    RTEPermissionInfo *target_perminfo;
    MemoryContext oldctx;
    bool        run_as_owner;
 
    /*
     * Quick return if we are skipping data modification changes or handling
     * streamed transactions.
     */
    if (is_skipping_changes() ||
        handle_streamed_transaction(LOGICAL_REP_MSG_UPDATE, s))
        return;
 
    begin_replication_step();
 
    relid = logicalrep_read_update(s, &has_oldtup, &oldtup,
                                   &newtup);
    rel = logicalrep_rel_open(relid, RowExclusiveLock);
    if (!should_apply_changes_for_rel(rel))
    {
        /*
         * The relation can't become interesting in the middle of the
         * transaction so it's safe to unlock it.
         */
        logicalrep_rel_close(rel, RowExclusiveLock);
        end_replication_step();
        return;
    }
 
    /* Set relation for error callback */
    apply_error_callback_arg.rel = rel;
 
    /* Check if we can do the update. */
    check_relation_updatable(rel);
 
    /*
     * Make sure that any user-supplied code runs as the table owner, unless
     * the user has opted out of that behavior.
     */
    run_as_owner = MySubscription->runasowner;
    if (!run_as_owner)
        SwitchToUntrustedUser(rel->localrel->rd_rel->relowner, &ucxt);
 
    /* Initialize the executor state. */
    edata = create_edata_for_relation(rel);
    estate = edata->estate;
    remoteslot = ExecInitExtraTupleSlot(estate,
                                        RelationGetDescr(rel->localrel),
                                        &TTSOpsVirtual);
 
    /*
     * Populate updatedCols so that per-column triggers can fire, and so
     * executor can correctly pass down indexUnchanged hint.  This could
     * include more columns than were actually changed on the publisher
     * because the logical replication protocol doesn't contain that
     * information.  But it would for example exclude columns that only exist
     * on the subscriber, since we are not touching those.
     */
    target_perminfo = list_nth(estate->es_rteperminfos, 0);
    for (int i = 0; i < remoteslot->tts_tupleDescriptor->natts; i++)
    {
        Form_pg_attribute att = TupleDescAttr(remoteslot->tts_tupleDescriptor, i);
        int         remoteattnum = rel->attrmap->attnums[i];
 
        if (!att->attisdropped && remoteattnum >= 0)
        {
            Assert(remoteattnum < newtup.ncols);
            if (newtup.colstatus[remoteattnum] != LOGICALREP_COLUMN_UNCHANGED)
                target_perminfo->updatedCols =
                    bms_add_member(target_perminfo->updatedCols,
                                   i + 1 - FirstLowInvalidHeapAttributeNumber);
        }
    }
 
    /* Build the search tuple. */
    oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
    slot_store_data(remoteslot, rel,
                    has_oldtup ? &oldtup : &newtup);
    MemoryContextSwitchTo(oldctx);
 
    /* For a partitioned table, apply update to correct partition. */
    if (rel->localrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
        apply_handle_tuple_routing(edata,
                                   remoteslot, &newtup, CMD_UPDATE);
    else
        apply_handle_update_internal(edata, edata->targetRelInfo,
                                     remoteslot, &newtup, rel->localindexoid);
 
    finish_edata(edata);
 
    /* Reset relation for error callback */
    apply_error_callback_arg.rel = NULL;
 
    if (!run_as_owner)
        RestoreUserContext(&ucxt);
 
    logicalrep_rel_close(rel, NoLock);
 
    end_replication_step();
}

References apply_error_callback_arg, apply_handle_tuple_routing(), apply_handle_update_internal(), Assert, AttrMap::attnums, LogicalRepRelMapEntry::attrmap, begin_replication_step(), bms_add_member(), check_relation_updatable(), CMD_UPDATE, LogicalRepTupleData::colstatus, create_edata_for_relation(), end_replication_step(), EState::es_rteperminfos, ApplyExecutionData::estate, ExecInitExtraTupleSlot(), finish_edata(), FirstLowInvalidHeapAttributeNumber, GetPerTupleMemoryContext, handle_streamed_transaction(), i, is_skipping_changes, list_nth(), LogicalRepRelMapEntry::localindexoid, LogicalRepRelMapEntry::localrel, LOGICAL_REP_MSG_UPDATE, LOGICALREP_COLUMN_UNCHANGED, logicalrep_read_update(), logicalrep_rel_close(), logicalrep_rel_open(), MemoryContextSwitchTo(), MySubscription, TupleDescData::natts, LogicalRepTupleData::ncols, NoLock, RelationData::rd_rel, ApplyErrorCallbackArg::rel, RelationGetDescr, RestoreUserContext(), RowExclusiveLock, Subscription::runasowner, should_apply_changes_for_rel(), slot_store_data(), SwitchToUntrustedUser(), ApplyExecutionData::targetRelInfo, TupleTableSlot::tts_tupleDescriptor, TTSOpsVirtual, TupleDescAttr, and RTEPermissionInfo::updatedCols.

Referenced by apply_dispatch().

apply_handle_update_internal()

static void apply_handle_update_internal ( ApplyExecutionData *  edata, ResultRelInfo *  relinfo, TupleTableSlot *  remoteslot, LogicalRepTupleData *  newtup, Oid  localindexoid  )

static

Definition at line 2659 of file worker.c.

{
    EState     *estate = edata->estate;
    LogicalRepRelMapEntry *relmapentry = edata->targetRel;
    Relation    localrel = relinfo->ri_RelationDesc;
    EPQState    epqstate;
    TupleTableSlot *localslot;
    bool        found;
    MemoryContext oldctx;
 
    EvalPlanQualInit(&epqstate, estate, NULL, NIL, -1, NIL);
    ExecOpenIndices(relinfo, true);
 
    found = FindReplTupleInLocalRel(edata, localrel,
                                    &relmapentry->remoterel,
                                    localindexoid,
                                    remoteslot, &localslot);
 
    /*
     * Tuple found.
     *
     * Note this will fail if there are other conflicting unique indexes.
     */
    if (found)
    {
        RepOriginId localorigin;
        TransactionId localxmin;
        TimestampTz localts;
 
        /*
         * Report the conflict if the tuple was modified by a different
         * origin.
         */
        if (GetTupleTransactionInfo(localslot, &localxmin, &localorigin, &localts) &&
            localorigin != replorigin_session_origin)
        {
            TupleTableSlot *newslot;
 
            /* Store the new tuple for conflict reporting */
            newslot = table_slot_create(localrel, &estate->es_tupleTable);
            slot_store_data(newslot, relmapentry, newtup);
 
            ReportApplyConflict(estate, relinfo, LOG, CT_UPDATE_ORIGIN_DIFFERS,
                                remoteslot, localslot, newslot,
                                InvalidOid, localxmin, localorigin, localts);
        }
 
        /* Process and store remote tuple in the slot */
        oldctx = MemoryContextSwitchTo(GetPerTupleMemoryContext(estate));
        slot_modify_data(remoteslot, localslot, relmapentry, newtup);
        MemoryContextSwitchTo(oldctx);
 
        EvalPlanQualSetSlot(&epqstate, remoteslot);
 
        InitConflictIndexes(relinfo);
 
        /* Do the actual update. */
        TargetPrivilegesCheck(relinfo->ri_RelationDesc, ACL_UPDATE);
        ExecSimpleRelationUpdate(relinfo, estate, &epqstate, localslot,
                                 remoteslot);
    }
    else
    {
        TupleTableSlot *newslot = localslot;
 
        /* Store the new tuple for conflict reporting */
        slot_store_data(newslot, relmapentry, newtup);
 
        /*
         * The tuple to be updated could not be found.  Do nothing except for
         * emitting a log message.
         */
        ReportApplyConflict(estate, relinfo, LOG, CT_UPDATE_MISSING,
                            remoteslot, NULL, newslot,
                            InvalidOid, InvalidTransactionId,
                            InvalidRepOriginId, 0);
    }
 
    /* Cleanup. */
    ExecCloseIndices(relinfo);
    EvalPlanQualEnd(&epqstate);
}

References ACL_UPDATE, CT_UPDATE_MISSING, CT_UPDATE_ORIGIN_DIFFERS, EState::es_tupleTable, ApplyExecutionData::estate, EvalPlanQualEnd(), EvalPlanQualInit(), EvalPlanQualSetSlot, ExecCloseIndices(), ExecOpenIndices(), ExecSimpleRelationUpdate(), FindReplTupleInLocalRel(), GetPerTupleMemoryContext, GetTupleTransactionInfo(), InitConflictIndexes(), InvalidOid, InvalidRepOriginId, InvalidTransactionId, LOG, MemoryContextSwitchTo(), NIL, LogicalRepRelMapEntry::remoterel, replorigin_session_origin, ReportApplyConflict(), ResultRelInfo::ri_RelationDesc, slot_modify_data(), slot_store_data(), table_slot_create(), TargetPrivilegesCheck(), and ApplyExecutionData::targetRel.

Referenced by apply_handle_update().

apply_spooled_messages()

void apply_spooled_messages	(	FileSet *	stream_fileset,
		TransactionId	xid,
		XLogRecPtr	lsn
	)

Definition at line 2022 of file worker.c.

{
    int         nchanges;
    char        path[MAXPGPATH];
    char       *buffer = NULL;
    MemoryContext oldcxt;
    ResourceOwner oldowner;
    int         fileno;
    off_t       offset;
 
    if (!am_parallel_apply_worker())
        maybe_start_skipping_changes(lsn);
 
    /* Make sure we have an open transaction */
    begin_replication_step();
 
    /*
     * Allocate file handle and memory required to process all the messages in
     * TopTransactionContext to avoid them getting reset after each message is
     * processed.
     */
    oldcxt = MemoryContextSwitchTo(TopTransactionContext);
 
    /* Open the spool file for the committed/prepared transaction */
    changes_filename(path, MyLogicalRepWorker->subid, xid);
    elog(DEBUG1, "replaying changes from file \"%s\"", path);
 
    /*
     * Make sure the file is owned by the toplevel transaction so that the
     * file will not be accidentally closed when aborting a subtransaction.
     */
    oldowner = CurrentResourceOwner;
    CurrentResourceOwner = TopTransactionResourceOwner;
 
    stream_fd = BufFileOpenFileSet(stream_fileset, path, O_RDONLY, false);
 
    CurrentResourceOwner = oldowner;
 
    buffer = palloc(BLCKSZ);
 
    MemoryContextSwitchTo(oldcxt);
 
    remote_final_lsn = lsn;
 
    /*
     * Make sure the handle apply_dispatch methods are aware we're in a remote
     * transaction.
     */
    in_remote_transaction = true;
    pgstat_report_activity(STATE_RUNNING, NULL);
 
    end_replication_step();
 
    /*
     * Read the entries one by one and pass them through the same logic as in
     * apply_dispatch.
     */
    nchanges = 0;
    while (true)
    {
        StringInfoData s2;
        size_t      nbytes;
        int         len;
 
        CHECK_FOR_INTERRUPTS();
 
        /* read length of the on-disk record */
        nbytes = BufFileReadMaybeEOF(stream_fd, &len, sizeof(len), true);
 
        /* have we reached end of the file? */
        if (nbytes == 0)
            break;
 
        /* do we have a correct length? */
        if (len <= 0)
            elog(ERROR, "incorrect length %d in streaming transaction's changes file \"%s\"",
                 len, path);
 
        /* make sure we have sufficiently large buffer */
        buffer = repalloc(buffer, len);
 
        /* and finally read the data into the buffer */
        BufFileReadExact(stream_fd, buffer, len);
 
        BufFileTell(stream_fd, &fileno, &offset);
 
        /* init a stringinfo using the buffer and call apply_dispatch */
        initReadOnlyStringInfo(&s2, buffer, len);
 
        /* Ensure we are reading the data into our memory context. */
        oldcxt = MemoryContextSwitchTo(ApplyMessageContext);
 
        apply_dispatch(&s2);
 
        MemoryContextReset(ApplyMessageContext);
 
        MemoryContextSwitchTo(oldcxt);
 
        nchanges++;
 
        /*
         * It is possible the file has been closed because we have processed
         * the transaction end message like stream_commit in which case that
         * must be the last message.
         */
        if (!stream_fd)
        {
            ensure_last_message(stream_fileset, xid, fileno, offset);
            break;
        }
 
        if (nchanges % 1000 == 0)
            elog(DEBUG1, "replayed %d changes from file \"%s\"",
                 nchanges, path);
    }
 
    if (stream_fd)
        stream_close_file();
 
    elog(DEBUG1, "replayed %d (all) changes from file \"%s\"",
         nchanges, path);
 
    return;
}

References am_parallel_apply_worker(), apply_dispatch(), ApplyMessageContext, begin_replication_step(), BufFileOpenFileSet(), BufFileReadExact(), BufFileReadMaybeEOF(), BufFileTell(), changes_filename(), CHECK_FOR_INTERRUPTS, CurrentResourceOwner, DEBUG1, elog, end_replication_step(), ensure_last_message(), ERROR, in_remote_transaction, initReadOnlyStringInfo(), len, MAXPGPATH, maybe_start_skipping_changes(), MemoryContextReset(), MemoryContextSwitchTo(), MyLogicalRepWorker, palloc(), pgstat_report_activity(), remote_final_lsn, repalloc(), s2, STATE_RUNNING, stream_close_file(), stream_fd, LogicalRepWorker::subid, TopTransactionContext, and TopTransactionResourceOwner.

Referenced by apply_handle_stream_commit(), apply_handle_stream_prepare(), and pa_process_spooled_messages_if_required().

apply_worker_exit()

static void apply_worker_exit ( void  )

static

Definition at line 3923 of file worker.c.

{
    if (am_parallel_apply_worker())
    {
        /*
         * Don't stop the parallel apply worker as the leader will detect the
         * subscription parameter change and restart logical replication later
         * anyway. This also prevents the leader from reporting errors when
         * trying to communicate with a stopped parallel apply worker, which
         * would accidentally disable subscriptions if disable_on_error was
         * set.
         */
        return;
    }
 
    /*
     * Reset the last-start time for this apply worker so that the launcher
     * will restart it without waiting for wal_retrieve_retry_interval if the
     * subscription is still active, and so that we won't leak that hash table
     * entry if it isn't.
     */
    if (am_leader_apply_worker())
        ApplyLauncherForgetWorkerStartTime(MyLogicalRepWorker->subid);
 
    proc_exit(0);
}

References am_leader_apply_worker(), am_parallel_apply_worker(), ApplyLauncherForgetWorkerStartTime(), MyLogicalRepWorker, proc_exit(), and LogicalRepWorker::subid.

Referenced by InitializeLogRepWorker(), and maybe_reread_subscription().

ApplyWorkerMain()

void ApplyWorkerMain

(

Datum

main_arg

)

Definition at line 4784 of file worker.c.

{
    int         worker_slot = DatumGetInt32(main_arg);
 
    InitializingApplyWorker = true;
 
    SetupApplyOrSyncWorker(worker_slot);
 
    InitializingApplyWorker = false;
 
    run_apply_worker();
 
    proc_exit(0);
}

References DatumGetInt32(), InitializingApplyWorker, proc_exit(), run_apply_worker(), and SetupApplyOrSyncWorker().

AtEOXact_LogicalRepWorkers()

void AtEOXact_LogicalRepWorkers

(

bool

isCommit

)

Definition at line 5113 of file worker.c.

{
    if (isCommit && on_commit_wakeup_workers_subids != NIL)
    {
        ListCell   *lc;
 
        LWLockAcquire(LogicalRepWorkerLock, LW_SHARED);
        foreach(lc, on_commit_wakeup_workers_subids)
        {
            Oid         subid = lfirst_oid(lc);
            List       *workers;
            ListCell   *lc2;
 
            workers = logicalrep_workers_find(subid, true, false);
            foreach(lc2, workers)
            {
                LogicalRepWorker *worker = (LogicalRepWorker *) lfirst(lc2);
 
                logicalrep_worker_wakeup_ptr(worker);
            }
        }
        LWLockRelease(LogicalRepWorkerLock);
    }
 
    /* The List storage will be reclaimed automatically in xact cleanup. */
    on_commit_wakeup_workers_subids = NIL;
}

References lfirst, lfirst_oid, logicalrep_worker_wakeup_ptr(), logicalrep_workers_find(), LW_SHARED, LWLockAcquire(), LWLockRelease(), NIL, and on_commit_wakeup_workers_subids.

Referenced by AbortTransaction(), CommitTransaction(), and PrepareTransaction().

begin_replication_step()

static void begin_replication_step ( void  )

static

Definition at line 506 of file worker.c.

{
    SetCurrentStatementStartTimestamp();
 
    if (!IsTransactionState())
    {
        StartTransactionCommand();
        maybe_reread_subscription();
    }
 
    PushActiveSnapshot(GetTransactionSnapshot());
 
    MemoryContextSwitchTo(ApplyMessageContext);
}

References ApplyMessageContext, GetTransactionSnapshot(), IsTransactionState(), maybe_reread_subscription(), MemoryContextSwitchTo(), PushActiveSnapshot(), SetCurrentStatementStartTimestamp(), and StartTransactionCommand().

Referenced by apply_handle_commit_prepared(), apply_handle_delete(), apply_handle_insert(), apply_handle_prepare(), apply_handle_rollback_prepared(), apply_handle_stream_prepare(), apply_handle_truncate(), apply_handle_update(), apply_spooled_messages(), ensure_last_message(), stream_abort_internal(), and stream_start_internal().

changes_filename()

static void changes_filename ( char *  path, Oid  subid, TransactionId  xid  )

inlinestatic

Definition at line 4283 of file worker.c.

{
    snprintf(path, MAXPGPATH, "%u-%u.changes", subid, xid);
}

References MAXPGPATH, and snprintf.

Referenced by apply_spooled_messages(), ensure_last_message(), stream_abort_internal(), stream_cleanup_files(), and stream_open_file().

check_relation_updatable()

static void check_relation_updatable ( LogicalRepRelMapEntry *  rel )

static

Definition at line 2501 of file worker.c.

{
    /*
     * For partitioned tables, we only need to care if the target partition is
     * updatable (aka has PK or RI defined for it).
     */
    if (rel->localrel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
        return;
 
    /* Updatable, no error. */
    if (rel->updatable)
        return;
 
    /*
     * We are in error mode so it's fine this is somewhat slow. It's better to
     * give user correct error.
     */
    if (OidIsValid(GetRelationIdentityOrPK(rel->localrel)))
    {
        ereport(ERROR,
                (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
                 errmsg("publisher did not send replica identity column "
                        "expected by the logical replication target relation \"%s.%s\"",
                        rel->remoterel.nspname, rel->remoterel.relname)));
    }
 
    ereport(ERROR,
            (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
             errmsg("logical replication target relation \"%s.%s\" has "
                    "neither REPLICA IDENTITY index nor PRIMARY "
                    "KEY and published relation does not have "
                    "REPLICA IDENTITY FULL",
                    rel->remoterel.nspname, rel->remoterel.relname)));
}

References ereport, errcode(), errmsg(), ERROR, GetRelationIdentityOrPK(), LogicalRepRelMapEntry::localrel, LogicalRepRelation::nspname, OidIsValid, RelationData::rd_rel, LogicalRepRelation::relname, LogicalRepRelMapEntry::remoterel, and LogicalRepRelMapEntry::updatable.

Referenced by apply_handle_delete(), apply_handle_tuple_routing(), and apply_handle_update().

cleanup_subxact_info()

static void cleanup_subxact_info ( void  )

inlinestatic

Definition at line 4480 of file worker.c.

{
    if (subxact_data.subxacts)
        pfree(subxact_data.subxacts);
 
    subxact_data.subxacts = NULL;
    subxact_data.subxact_last = InvalidTransactionId;
    subxact_data.nsubxacts = 0;
    subxact_data.nsubxacts_max = 0;
}

References InvalidTransactionId, ApplySubXactData::nsubxacts, ApplySubXactData::nsubxacts_max, pfree(), subxact_data, ApplySubXactData::subxact_last, and ApplySubXactData::subxacts.

Referenced by stream_abort_internal(), and subxact_info_write().

clear_subscription_skip_lsn()

static void clear_subscription_skip_lsn ( XLogRecPtr  finish_lsn )

static

Definition at line 4911 of file worker.c.

{
    Relation    rel;
    Form_pg_subscription subform;
    HeapTuple   tup;
    XLogRecPtr  myskiplsn = MySubscription->skiplsn;
    bool        started_tx = false;
 
    if (likely(XLogRecPtrIsInvalid(myskiplsn)) || am_parallel_apply_worker())
        return;
 
    if (!IsTransactionState())
    {
        StartTransactionCommand();
        started_tx = true;
    }
 
    /*
     * Protect subskiplsn of pg_subscription from being concurrently updated
     * while clearing it.
     */
    LockSharedObject(SubscriptionRelationId, MySubscription->oid, 0,
                     AccessShareLock);
 
    rel = table_open(SubscriptionRelationId, RowExclusiveLock);
 
    /* Fetch the existing tuple. */
    tup = SearchSysCacheCopy1(SUBSCRIPTIONOID,
                              ObjectIdGetDatum(MySubscription->oid));
 
    if (!HeapTupleIsValid(tup))
        elog(ERROR, "subscription \"%s\" does not exist", MySubscription->name);
 
    subform = (Form_pg_subscription) GETSTRUCT(tup);
 
    /*
     * Clear the subskiplsn. If the user has already changed subskiplsn before
     * clearing it we don't update the catalog and the replication origin
     * state won't get advanced. So in the worst case, if the server crashes
     * before sending an acknowledgment of the flush position the transaction
     * will be sent again and the user needs to set subskiplsn again. We can
     * reduce the possibility by logging a replication origin WAL record to
     * advance the origin LSN instead but there is no way to advance the
     * origin timestamp and it doesn't seem to be worth doing anything about
     * it since it's a very rare case.
     */
    if (subform->subskiplsn == myskiplsn)
    {
        bool        nulls[Natts_pg_subscription];
        bool        replaces[Natts_pg_subscription];
        Datum       values[Natts_pg_subscription];
 
        memset(values, 0, sizeof(values));
        memset(nulls, false, sizeof(nulls));
        memset(replaces, false, sizeof(replaces));
 
        /* reset subskiplsn */
        values[Anum_pg_subscription_subskiplsn - 1] = LSNGetDatum(InvalidXLogRecPtr);
        replaces[Anum_pg_subscription_subskiplsn - 1] = true;
 
        tup = heap_modify_tuple(tup, RelationGetDescr(rel), values, nulls,
                                replaces);
        CatalogTupleUpdate(rel, &tup->t_self, tup);
 
        if (myskiplsn != finish_lsn)
            ereport(WARNING,
                    errmsg("skip-LSN of subscription \"%s\" cleared", MySubscription->name),
                    errdetail("Remote transaction's finish WAL location (LSN) %X/%X did not match skip-LSN %X/%X.",
                              LSN_FORMAT_ARGS(finish_lsn),
                              LSN_FORMAT_ARGS(myskiplsn)));
    }
 
    heap_freetuple(tup);
    table_close(rel, NoLock);
 
    if (started_tx)
        CommitTransactionCommand();
}

References AccessShareLock, am_parallel_apply_worker(), CatalogTupleUpdate(), CommitTransactionCommand(), elog, ereport, errdetail(), errmsg(), ERROR, GETSTRUCT, heap_freetuple(), heap_modify_tuple(), HeapTupleIsValid, InvalidXLogRecPtr, IsTransactionState(), likely, LockSharedObject(), LSN_FORMAT_ARGS, LSNGetDatum(), MySubscription, Subscription::name, NoLock, ObjectIdGetDatum(), Subscription::oid, RelationGetDescr, RowExclusiveLock, SearchSysCacheCopy1, Subscription::skiplsn, StartTransactionCommand(), HeapTupleData::t_self, table_close(), table_open(), values, WARNING, and XLogRecPtrIsInvalid.

Referenced by apply_handle_commit_internal(), apply_handle_commit_prepared(), apply_handle_prepare(), apply_handle_rollback_prepared(), and apply_handle_stream_prepare().

create_edata_for_relation()

static ApplyExecutionData* create_edata_for_relation ( LogicalRepRelMapEntry *  rel )

static

Definition at line 650 of file worker.c.

{
    ApplyExecutionData *edata;
    EState     *estate;
    RangeTblEntry *rte;
    List       *perminfos = NIL;
    ResultRelInfo *resultRelInfo;
 
    edata = (ApplyExecutionData *) palloc0(sizeof(ApplyExecutionData));
    edata->targetRel = rel;
 
    edata->estate = estate = CreateExecutorState();
 
    rte = makeNode(RangeTblEntry);
    rte->rtekind = RTE_RELATION;
    rte->relid = RelationGetRelid(rel->localrel);
    rte->relkind = rel->localrel->rd_rel->relkind;
    rte->rellockmode = AccessShareLock;
 
    addRTEPermissionInfo(&perminfos, rte);
 
    ExecInitRangeTable(estate, list_make1(rte), perminfos);
 
    edata->targetRelInfo = resultRelInfo = makeNode(ResultRelInfo);
 
    /*
     * Use Relation opened by logicalrep_rel_open() instead of opening it
     * again.
     */
    InitResultRelInfo(resultRelInfo, rel->localrel, 1, NULL, 0);
 
    /*
     * We put the ResultRelInfo in the es_opened_result_relations list, even
     * though we don't populate the es_result_relations array.  That's a bit
     * bogus, but it's enough to make ExecGetTriggerResultRel() find them.
     *
     * ExecOpenIndices() is not called here either, each execution path doing
     * an apply operation being responsible for that.
     */
    estate->es_opened_result_relations =
        lappend(estate->es_opened_result_relations, resultRelInfo);
 
    estate->es_output_cid = GetCurrentCommandId(true);
 
    /* Prepare to catch AFTER triggers. */
    AfterTriggerBeginQuery();
 
    /* other fields of edata remain NULL for now */
 
    return edata;
}

References AccessShareLock, addRTEPermissionInfo(), AfterTriggerBeginQuery(), CreateExecutorState(), EState::es_opened_result_relations, EState::es_output_cid, ApplyExecutionData::estate, ExecInitRangeTable(), GetCurrentCommandId(), InitResultRelInfo(), lappend(), list_make1, LogicalRepRelMapEntry::localrel, makeNode, NIL, palloc0(), RelationData::rd_rel, RelationGetRelid, RangeTblEntry::relid, RTE_RELATION, RangeTblEntry::rtekind, ApplyExecutionData::targetRel, and ApplyExecutionData::targetRelInfo.

Referenced by apply_handle_delete(), apply_handle_insert(), and apply_handle_update().

DisableSubscriptionAndExit()

void DisableSubscriptionAndExit

(

void

)

Definition at line 4804 of file worker.c.

{
    /*
     * Emit the error message, and recover from the error state to an idle
     * state
     */
    HOLD_INTERRUPTS();
 
    EmitErrorReport();
    AbortOutOfAnyTransaction();
    FlushErrorState();
 
    RESUME_INTERRUPTS();
 
    /* Report the worker failed during either table synchronization or apply */
    pgstat_report_subscription_error(MyLogicalRepWorker->subid,
                                     !am_tablesync_worker());
 
    /* Disable the subscription */
    StartTransactionCommand();
    DisableSubscription(MySubscription->oid);
    CommitTransactionCommand();
 
    /* Ensure we remove no-longer-useful entry for worker's start time */
    if (am_leader_apply_worker())
        ApplyLauncherForgetWorkerStartTime(MyLogicalRepWorker->subid);
 
    /* Notify the subscription has been disabled and exit */
    ereport(LOG,
            errmsg("subscription \"%s\" has been disabled because of an error",
                   MySubscription->name));
 
    proc_exit(0);
}

References AbortOutOfAnyTransaction(), am_leader_apply_worker(), am_tablesync_worker(), ApplyLauncherForgetWorkerStartTime(), CommitTransactionCommand(), DisableSubscription(), EmitErrorReport(), ereport, errmsg(), FlushErrorState(), HOLD_INTERRUPTS, LOG, MyLogicalRepWorker, MySubscription, Subscription::name, Subscription::oid, pgstat_report_subscription_error(), proc_exit(), RESUME_INTERRUPTS, StartTransactionCommand(), and LogicalRepWorker::subid.

Referenced by start_apply(), and start_table_sync().

end_replication_step()

static void end_replication_step ( void  )

static

Definition at line 529 of file worker.c.

{
    PopActiveSnapshot();
 
    CommandCounterIncrement();
}

References CommandCounterIncrement(), and PopActiveSnapshot().

Referenced by apply_handle_commit_prepared(), apply_handle_delete(), apply_handle_insert(), apply_handle_prepare(), apply_handle_rollback_prepared(), apply_handle_stream_prepare(), apply_handle_truncate(), apply_handle_update(), apply_spooled_messages(), ensure_last_message(), stream_abort_internal(), and stream_start_internal().

ensure_last_message()

static void ensure_last_message ( FileSet *  stream_fileset, TransactionId  xid, int  fileno, off_t  offset  )

static

Definition at line 1990 of file worker.c.

{
    char        path[MAXPGPATH];
    BufFile    *fd;
    int         last_fileno;
    off_t       last_offset;
 
    Assert(!IsTransactionState());
 
    begin_replication_step();
 
    changes_filename(path, MyLogicalRepWorker->subid, xid);
 
    fd = BufFileOpenFileSet(stream_fileset, path, O_RDONLY, false);
 
    BufFileSeek(fd, 0, 0, SEEK_END);
    BufFileTell(fd, &last_fileno, &last_offset);
 
    BufFileClose(fd);
 
    end_replication_step();
 
    if (last_fileno != fileno || last_offset != offset)
        elog(ERROR, "unexpected message left in streaming transaction's changes file \"%s\"",
             path);
}

References Assert, begin_replication_step(), BufFileClose(), BufFileOpenFileSet(), BufFileSeek(), BufFileTell(), changes_filename(), elog, end_replication_step(), ERROR, fd(), IsTransactionState(), MAXPGPATH, MyLogicalRepWorker, and LogicalRepWorker::subid.

Referenced by apply_spooled_messages().

FindReplTupleInLocalRel()

static bool FindReplTupleInLocalRel ( ApplyExecutionData *  edata, Relation  localrel, LogicalRepRelation *  remoterel, Oid  localidxoid, TupleTableSlot *  remoteslot, TupleTableSlot **  localslot  )

static

Definition at line 2906 of file worker.c.

{
    EState     *estate = edata->estate;
    bool        found;
 
    /*
     * Regardless of the top-level operation, we're performing a read here, so
     * check for SELECT privileges.
     */
    TargetPrivilegesCheck(localrel, ACL_SELECT);
 
    *localslot = table_slot_create(localrel, &estate->es_tupleTable);
 
    Assert(OidIsValid(localidxoid) ||
           (remoterel->replident == REPLICA_IDENTITY_FULL));
 
    if (OidIsValid(localidxoid))
    {
#ifdef USE_ASSERT_CHECKING
        Relation    idxrel = index_open(localidxoid, AccessShareLock);
 
        /* Index must be PK, RI, or usable for REPLICA IDENTITY FULL tables */
        Assert(GetRelationIdentityOrPK(localrel) == localidxoid ||
               (remoterel->replident == REPLICA_IDENTITY_FULL &&
                IsIndexUsableForReplicaIdentityFull(BuildIndexInfo(idxrel),
                                                    edata->targetRel->attrmap)));
        index_close(idxrel, AccessShareLock);
#endif
 
        found = RelationFindReplTupleByIndex(localrel, localidxoid,
                                             LockTupleExclusive,
                                             remoteslot, *localslot);
    }
    else
        found = RelationFindReplTupleSeq(localrel, LockTupleExclusive,
                                         remoteslot, *localslot);
 
    return found;
}

References AccessShareLock, ACL_SELECT, Assert, LogicalRepRelMapEntry::attrmap, BuildIndexInfo(), EState::es_tupleTable, ApplyExecutionData::estate, GetRelationIdentityOrPK(), index_close(), index_open(), IsIndexUsableForReplicaIdentityFull(), LockTupleExclusive, OidIsValid, RelationFindReplTupleByIndex(), RelationFindReplTupleSeq(), LogicalRepRelation::replident, table_slot_create(), TargetPrivilegesCheck(), and ApplyExecutionData::targetRel.

Referenced by apply_handle_delete_internal(), apply_handle_tuple_routing(), and apply_handle_update_internal().

finish_edata()

static void finish_edata ( ApplyExecutionData *  edata )

static

Definition at line 707 of file worker.c.

{
    EState     *estate = edata->estate;
 
    /* Handle any queued AFTER triggers. */
    AfterTriggerEndQuery(estate);
 
    /* Shut down tuple routing, if any was done. */
    if (edata->proute)
        ExecCleanupTupleRouting(edata->mtstate, edata->proute);
 
    /*
     * Cleanup.  It might seem that we should call ExecCloseResultRelations()
     * here, but we intentionally don't.  It would close the rel we added to
     * es_opened_result_relations above, which is wrong because we took no
     * corresponding refcount.  We rely on ExecCleanupTupleRouting() to close
     * any other relations opened during execution.
     */
    ExecResetTupleTable(estate->es_tupleTable, false);
    FreeExecutorState(estate);
    pfree(edata);
}

References AfterTriggerEndQuery(), EState::es_tupleTable, ApplyExecutionData::estate, ExecCleanupTupleRouting(), ExecResetTupleTable(), FreeExecutorState(), ApplyExecutionData::mtstate, pfree(), and ApplyExecutionData::proute.

Referenced by apply_handle_delete(), apply_handle_insert(), and apply_handle_update().

get_flush_position()

static void get_flush_position ( XLogRecPtr *  write, XLogRecPtr *  flush, bool *  have_pending_txes  )

static

Definition at line 3484 of file worker.c.

{
    dlist_mutable_iter iter;
    XLogRecPtr  local_flush = GetFlushRecPtr(NULL);
 
    *write = InvalidXLogRecPtr;
    *flush = InvalidXLogRecPtr;
 
    dlist_foreach_modify(iter, &lsn_mapping)
    {
        FlushPosition *pos =
            dlist_container(FlushPosition, node, iter.cur);
 
        *write = pos->remote_end;
 
        if (pos->local_end <= local_flush)
        {
            *flush = pos->remote_end;
            dlist_delete(iter.cur);
            pfree(pos);
        }
        else
        {
            /*
             * Don't want to uselessly iterate over the rest of the list which
             * could potentially be long. Instead get the last element and
             * grab the write position from there.
             */
            pos = dlist_tail_element(FlushPosition, node,
                                     &lsn_mapping);
            *write = pos->remote_end;
            *have_pending_txes = true;
            return;
        }
    }
 
    *have_pending_txes = !dlist_is_empty(&lsn_mapping);
}

References dlist_mutable_iter::cur, dlist_container, dlist_delete(), dlist_foreach_modify, dlist_is_empty(), dlist_tail_element, GetFlushRecPtr(), InvalidXLogRecPtr, FlushPosition::local_end, lsn_mapping, pfree(), FlushPosition::remote_end, and write.

Referenced by send_feedback().

get_transaction_apply_action()

static TransApplyAction get_transaction_apply_action ( TransactionId  xid, ParallelApplyWorkerInfo **  winfo  )

static

Definition at line 5160 of file worker.c.

{
    *winfo = NULL;
 
    if (am_parallel_apply_worker())
    {
        return TRANS_PARALLEL_APPLY;
    }
 
    /*
     * If we are processing this transaction using a parallel apply worker
     * then either we send the changes to the parallel worker or if the worker
     * is busy then serialize the changes to the file which will later be
     * processed by the parallel worker.
     */
    *winfo = pa_find_worker(xid);
 
    if (*winfo && (*winfo)->serialize_changes)
    {
        return TRANS_LEADER_PARTIAL_SERIALIZE;
    }
    else if (*winfo)
    {
        return TRANS_LEADER_SEND_TO_PARALLEL;
    }
 
    /*
     * If there is no parallel worker involved to process this transaction
     * then we either directly apply the change or serialize it to a file
     * which will later be applied when the transaction finish message is
     * processed.
     */
    else if (in_streamed_transaction)
    {
        return TRANS_LEADER_SERIALIZE;
    }
    else
    {
        return TRANS_LEADER_APPLY;
    }
}

References am_parallel_apply_worker(), in_streamed_transaction, pa_find_worker(), ParallelApplyWorkerInfo::serialize_changes, TRANS_LEADER_APPLY, TRANS_LEADER_PARTIAL_SERIALIZE, TRANS_LEADER_SEND_TO_PARALLEL, TRANS_LEADER_SERIALIZE, and TRANS_PARALLEL_APPLY.

Referenced by apply_handle_stream_abort(), apply_handle_stream_commit(), apply_handle_stream_prepare(), apply_handle_stream_start(), apply_handle_stream_stop(), and handle_streamed_transaction().

handle_streamed_transaction()

static bool handle_streamed_transaction ( LogicalRepMsgType  action, StringInfo  s  )

static

Definition at line 557 of file worker.c.

{
    TransactionId current_xid;
    ParallelApplyWorkerInfo *winfo;
    TransApplyAction apply_action;
    StringInfoData original_msg;
 
    apply_action = get_transaction_apply_action(stream_xid, &winfo);
 
    /* not in streaming mode */
    if (apply_action == TRANS_LEADER_APPLY)
        return false;
 
    Assert(TransactionIdIsValid(stream_xid));
 
    /*
     * The parallel apply worker needs the xid in this message to decide
     * whether to define a savepoint, so save the original message that has
     * not moved the cursor after the xid. We will serialize this message to a
     * file in PARTIAL_SERIALIZE mode.
     */
    original_msg = *s;
 
    /*
     * We should have received XID of the subxact as the first part of the
     * message, so extract it.
     */
    current_xid = pq_getmsgint(s, 4);
 
    if (!TransactionIdIsValid(current_xid))
        ereport(ERROR,
                (errcode(ERRCODE_PROTOCOL_VIOLATION),
                 errmsg_internal("invalid transaction ID in streamed replication transaction")));
 
    switch (apply_action)
    {
        case TRANS_LEADER_SERIALIZE:
            Assert(stream_fd);
 
            /* Add the new subxact to the array (unless already there). */
            subxact_info_add(current_xid);
 
            /* Write the change to the current file */
            stream_write_change(action, s);
            return true;
 
        case TRANS_LEADER_SEND_TO_PARALLEL:
            Assert(winfo);
 
            /*
             * XXX The publisher side doesn't always send relation/type update
             * messages after the streaming transaction, so also update the
             * relation/type in leader apply worker. See function
             * cleanup_rel_sync_cache.
             */
            if (pa_send_data(winfo, s->len, s->data))
                return (action != LOGICAL_REP_MSG_RELATION &&
                        action != LOGICAL_REP_MSG_TYPE);
 
            /*
             * Switch to serialize mode when we are not able to send the
             * change to parallel apply worker.
             */
            pa_switch_to_partial_serialize(winfo, false);
 
            /* fall through */
        case TRANS_LEADER_PARTIAL_SERIALIZE:
            stream_write_change(action, &original_msg);
 
            /* Same reason as TRANS_LEADER_SEND_TO_PARALLEL case. */
            return (action != LOGICAL_REP_MSG_RELATION &&
                    action != LOGICAL_REP_MSG_TYPE);
 
        case TRANS_PARALLEL_APPLY:
            parallel_stream_nchanges += 1;
 
            /* Define a savepoint for a subxact if needed. */
            pa_start_subtrans(current_xid, stream_xid);
            return false;
 
        default:
            elog(ERROR, "unexpected apply action: %d", (int) apply_action);
            return false;       /* silence compiler warning */
    }
}

References generate_unaccent_rules::action, Assert, StringInfoData::data, elog, ereport, errcode(), errmsg_internal(), ERROR, get_transaction_apply_action(), StringInfoData::len, LOGICAL_REP_MSG_RELATION, LOGICAL_REP_MSG_TYPE, pa_send_data(), pa_start_subtrans(), pa_switch_to_partial_serialize(), parallel_stream_nchanges, pq_getmsgint(), stream_fd, stream_write_change(), stream_xid, subxact_info_add(), TRANS_LEADER_APPLY, TRANS_LEADER_PARTIAL_SERIALIZE, TRANS_LEADER_SEND_TO_PARALLEL, TRANS_LEADER_SERIALIZE, TRANS_PARALLEL_APPLY, and TransactionIdIsValid.

Referenced by apply_handle_delete(), apply_handle_insert(), apply_handle_relation(), apply_handle_truncate(), apply_handle_type(), and apply_handle_update().

InitializeLogRepWorker()

void InitializeLogRepWorker

(

void

)

Definition at line 4636 of file worker.c.

{
    MemoryContext oldctx;
 
    /* Run as replica session replication role. */
    SetConfigOption("session_replication_role", "replica",
                    PGC_SUSET, PGC_S_OVERRIDE);
 
    /* Connect to our database. */
    BackgroundWorkerInitializeConnectionByOid(MyLogicalRepWorker->dbid,
                                              MyLogicalRepWorker->userid,
                                              0);
 
    /*
     * Set always-secure search path, so malicious users can't redirect user
     * code (e.g. pg_index.indexprs).
     */
    SetConfigOption("search_path", "", PGC_SUSET, PGC_S_OVERRIDE);
 
    /* Load the subscription into persistent memory context. */
    ApplyContext = AllocSetContextCreate(TopMemoryContext,
                                         "ApplyContext",
                                         ALLOCSET_DEFAULT_SIZES);
    StartTransactionCommand();
    oldctx = MemoryContextSwitchTo(ApplyContext);
 
    MySubscription = GetSubscription(MyLogicalRepWorker->subid, true);
    if (!MySubscription)
    {
        ereport(LOG,
                (errmsg("logical replication worker for subscription %u will not start because the subscription was removed during startup",
                        MyLogicalRepWorker->subid)));
 
        /* Ensure we remove no-longer-useful entry for worker's start time */
        if (am_leader_apply_worker())
            ApplyLauncherForgetWorkerStartTime(MyLogicalRepWorker->subid);
 
        proc_exit(0);
    }
 
    MySubscriptionValid = true;
    MemoryContextSwitchTo(oldctx);
 
    if (!MySubscription->enabled)
    {
        ereport(LOG,
                (errmsg("logical replication worker for subscription \"%s\" will not start because the subscription was disabled during startup",
                        MySubscription->name)));
 
        apply_worker_exit();
    }
 
    /* Setup synchronous commit according to the user's wishes */
    SetConfigOption("synchronous_commit", MySubscription->synccommit,
                    PGC_BACKEND, PGC_S_OVERRIDE);
 
    /*
     * Keep us informed about subscription or role changes. Note that the
     * role's superuser privilege can be revoked.
     */
    CacheRegisterSyscacheCallback(SUBSCRIPTIONOID,
                                  subscription_change_cb,
                                  (Datum) 0);
 
    CacheRegisterSyscacheCallback(AUTHOID,
                                  subscription_change_cb,
                                  (Datum) 0);
 
    if (am_tablesync_worker())
        ereport(LOG,
                (errmsg("logical replication table synchronization worker for subscription \"%s\", table \"%s\" has started",
                        MySubscription->name,
                        get_rel_name(MyLogicalRepWorker->relid))));
    else
        ereport(LOG,
                (errmsg("logical replication apply worker for subscription \"%s\" has started",
                        MySubscription->name)));
 
    CommitTransactionCommand();
}

References ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate, am_leader_apply_worker(), am_tablesync_worker(), apply_worker_exit(), ApplyContext, ApplyLauncherForgetWorkerStartTime(), BackgroundWorkerInitializeConnectionByOid(), CacheRegisterSyscacheCallback(), CommitTransactionCommand(), LogicalRepWorker::dbid, Subscription::enabled, ereport, errmsg(), get_rel_name(), GetSubscription(), LOG, MemoryContextSwitchTo(), MyLogicalRepWorker, MySubscription, MySubscriptionValid, Subscription::name, PGC_BACKEND, PGC_S_OVERRIDE, PGC_SUSET, proc_exit(), LogicalRepWorker::relid, SetConfigOption(), StartTransactionCommand(), LogicalRepWorker::subid, subscription_change_cb(), Subscription::synccommit, TopMemoryContext, and LogicalRepWorker::userid.

Referenced by ParallelApplyWorkerMain(), and SetupApplyOrSyncWorker().

IsLogicalParallelApplyWorker()

bool IsLogicalParallelApplyWorker

(

void

)

Definition at line 4852 of file worker.c.

{
    return IsLogicalWorker() && am_parallel_apply_worker();
}

References am_parallel_apply_worker(), and IsLogicalWorker().

Referenced by mq_putmessage().

IsLogicalWorker()

bool IsLogicalWorker

(

void

)

Definition at line 4843 of file worker.c.

{
    return MyLogicalRepWorker != NULL;
}

References MyLogicalRepWorker.

Referenced by IsLogicalParallelApplyWorker(), and ProcessInterrupts().

LogicalRepApplyLoop()

static void LogicalRepApplyLoop ( XLogRecPtr  last_received )

static

Definition at line 3570 of file worker.c.

{
    TimestampTz last_recv_timestamp = GetCurrentTimestamp();
    bool        ping_sent = false;
    TimeLineID  tli;
    ErrorContextCallback errcallback;
 
    /*
     * Init the ApplyMessageContext which we clean up after each replication
     * protocol message.
     */
    ApplyMessageContext = AllocSetContextCreate(ApplyContext,
                                                "ApplyMessageContext",
                                                ALLOCSET_DEFAULT_SIZES);
 
    /*
     * This memory context is used for per-stream data when the streaming mode
     * is enabled. This context is reset on each stream stop.
     */
    LogicalStreamingContext = AllocSetContextCreate(ApplyContext,
                                                    "LogicalStreamingContext",
                                                    ALLOCSET_DEFAULT_SIZES);
 
    /* mark as idle, before starting to loop */
    pgstat_report_activity(STATE_IDLE, NULL);
 
    /*
     * Push apply error context callback. Fields will be filled while applying
     * a change.
     */
    errcallback.callback = apply_error_callback;
    errcallback.previous = error_context_stack;
    error_context_stack = &errcallback;
    apply_error_context_stack = error_context_stack;
 
    /* This outer loop iterates once per wait. */
    for (;;)
    {
        pgsocket    fd = PGINVALID_SOCKET;
        int         rc;
        int         len;
        char       *buf = NULL;
        bool        endofstream = false;
        long        wait_time;
 
        CHECK_FOR_INTERRUPTS();
 
        MemoryContextSwitchTo(ApplyMessageContext);
 
        len = walrcv_receive(LogRepWorkerWalRcvConn, &buf, &fd);
 
        if (len != 0)
        {
            /* Loop to process all available data (without blocking). */
            for (;;)
            {
                CHECK_FOR_INTERRUPTS();
 
                if (len == 0)
                {
                    break;
                }
                else if (len < 0)
                {
                    ereport(LOG,
                            (errmsg("data stream from publisher has ended")));
                    endofstream = true;
                    break;
                }
                else
                {
                    int         c;
                    StringInfoData s;
 
                    if (ConfigReloadPending)
                    {
                        ConfigReloadPending = false;
                        ProcessConfigFile(PGC_SIGHUP);
                    }
 
                    /* Reset timeout. */
                    last_recv_timestamp = GetCurrentTimestamp();
                    ping_sent = false;
 
                    /* Ensure we are reading the data into our memory context. */
                    MemoryContextSwitchTo(ApplyMessageContext);
 
                    initReadOnlyStringInfo(&s, buf, len);
 
                    c = pq_getmsgbyte(&s);
 
                    if (c == 'w')
                    {
                        XLogRecPtr  start_lsn;
                        XLogRecPtr  end_lsn;
                        TimestampTz send_time;
 
                        start_lsn = pq_getmsgint64(&s);
                        end_lsn = pq_getmsgint64(&s);
                        send_time = pq_getmsgint64(&s);
 
                        if (last_received < start_lsn)
                            last_received = start_lsn;
 
                        if (last_received < end_lsn)
                            last_received = end_lsn;
 
                        UpdateWorkerStats(last_received, send_time, false);
 
                        apply_dispatch(&s);
                    }
                    else if (c == 'k')
                    {
                        XLogRecPtr  end_lsn;
                        TimestampTz timestamp;
                        bool        reply_requested;
 
                        end_lsn = pq_getmsgint64(&s);
                        timestamp = pq_getmsgint64(&s);
                        reply_requested = pq_getmsgbyte(&s);
 
                        if (last_received < end_lsn)
                            last_received = end_lsn;
 
                        send_feedback(last_received, reply_requested, false);
                        UpdateWorkerStats(last_received, timestamp, true);
                    }
                    /* other message types are purposefully ignored */
 
                    MemoryContextReset(ApplyMessageContext);
                }
 
                len = walrcv_receive(LogRepWorkerWalRcvConn, &buf, &fd);
            }
        }
 
        /* confirm all writes so far */
        send_feedback(last_received, false, false);
 
        if (!in_remote_transaction && !in_streamed_transaction)
        {
            /*
             * If we didn't get any transactions for a while there might be
             * unconsumed invalidation messages in the queue, consume them
             * now.
             */
            AcceptInvalidationMessages();
            maybe_reread_subscription();
 
            /* Process any table synchronization changes. */
            process_syncing_tables(last_received);
        }
 
        /* Cleanup the memory. */
        MemoryContextReset(ApplyMessageContext);
        MemoryContextSwitchTo(TopMemoryContext);
 
        /* Check if we need to exit the streaming loop. */
        if (endofstream)
            break;
 
        /*
         * Wait for more data or latch.  If we have unflushed transactions,
         * wake up after WalWriterDelay to see if they've been flushed yet (in
         * which case we should send a feedback message).  Otherwise, there's
         * no particular urgency about waking up unless we get data or a
         * signal.
         */
        if (!dlist_is_empty(&lsn_mapping))
            wait_time = WalWriterDelay;
        else
            wait_time = NAPTIME_PER_CYCLE;
 
        rc = WaitLatchOrSocket(MyLatch,
                               WL_SOCKET_READABLE | WL_LATCH_SET |
                               WL_TIMEOUT | WL_EXIT_ON_PM_DEATH,
                               fd, wait_time,
                               WAIT_EVENT_LOGICAL_APPLY_MAIN);
 
        if (rc & WL_LATCH_SET)
        {
            ResetLatch(MyLatch);
            CHECK_FOR_INTERRUPTS();
        }
 
        if (ConfigReloadPending)
        {
            ConfigReloadPending = false;
            ProcessConfigFile(PGC_SIGHUP);
        }
 
        if (rc & WL_TIMEOUT)
        {
            /*
             * We didn't receive anything new. If we haven't heard anything
             * from the server for more than wal_receiver_timeout / 2, ping
             * the server. Also, if it's been longer than
             * wal_receiver_status_interval since the last update we sent,
             * send a status update to the primary anyway, to report any
             * progress in applying WAL.
             */
            bool        requestReply = false;
 
            /*
             * Check if time since last receive from primary has reached the
             * configured limit.
             */
            if (wal_receiver_timeout > 0)
            {
                TimestampTz now = GetCurrentTimestamp();
                TimestampTz timeout;
 
                timeout =
                    TimestampTzPlusMilliseconds(last_recv_timestamp,
                                                wal_receiver_timeout);
 
                if (now >= timeout)
                    ereport(ERROR,
                            (errcode(ERRCODE_CONNECTION_FAILURE),
                             errmsg("terminating logical replication worker due to timeout")));
 
                /* Check to see if it's time for a ping. */
                if (!ping_sent)
                {
                    timeout = TimestampTzPlusMilliseconds(last_recv_timestamp,
                                                          (wal_receiver_timeout / 2));
                    if (now >= timeout)
                    {
                        requestReply = true;
                        ping_sent = true;
                    }
                }
            }
 
            send_feedback(last_received, requestReply, requestReply);
 
            /*
             * Force reporting to ensure long idle periods don't lead to
             * arbitrarily delayed stats. Stats can only be reported outside
             * of (implicit or explicit) transactions. That shouldn't lead to
             * stats being delayed for long, because transactions are either
             * sent as a whole on commit or streamed. Streamed transactions
             * are spilled to disk and applied on commit.
             */
            if (!IsTransactionState())
                pgstat_report_stat(true);
        }
    }
 
    /* Pop the error context stack */
    error_context_stack = errcallback.previous;
    apply_error_context_stack = error_context_stack;
 
    /* All done */
    walrcv_endstreaming(LogRepWorkerWalRcvConn, &tli);
}

References AcceptInvalidationMessages(), ALLOCSET_DEFAULT_SIZES, AllocSetContextCreate, apply_dispatch(), apply_error_callback(), apply_error_context_stack, ApplyContext, ApplyMessageContext, buf, ErrorContextCallback::callback, CHECK_FOR_INTERRUPTS, ConfigReloadPending, dlist_is_empty(), ereport, errcode(), errmsg(), ERROR, error_context_stack, fd(), GetCurrentTimestamp(), in_remote_transaction, in_streamed_transaction, initReadOnlyStringInfo(), IsTransactionState(), len, LOG, LogicalStreamingContext, LogRepWorkerWalRcvConn, lsn_mapping, maybe_reread_subscription(), MemoryContextReset(), MemoryContextSwitchTo(), MyLatch, NAPTIME_PER_CYCLE, now(), PGC_SIGHUP, PGINVALID_SOCKET, pgstat_report_activity(), pgstat_report_stat(), pq_getmsgbyte(), pq_getmsgint64(), ErrorContextCallback::previous, process_syncing_tables(), ProcessConfigFile(), ResetLatch(), send_feedback(), STATE_IDLE, TimestampTzPlusMilliseconds, TopMemoryContext, UpdateWorkerStats(), WaitLatchOrSocket(), wal_receiver_timeout, walrcv_endstreaming, walrcv_receive, WalWriterDelay, WL_EXIT_ON_PM_DEATH, WL_LATCH_SET, WL_SOCKET_READABLE, and WL_TIMEOUT.

Referenced by start_apply().

LogicalRepWorkersWakeupAtCommit()

void LogicalRepWorkersWakeupAtCommit

(

Oid

subid

)

Definition at line 5099 of file worker.c.

{
    MemoryContext oldcxt;
 
    oldcxt = MemoryContextSwitchTo(TopTransactionContext);
    on_commit_wakeup_workers_subids =
        list_append_unique_oid(on_commit_wakeup_workers_subids, subid);
    MemoryContextSwitchTo(oldcxt);
}

References list_append_unique_oid(), MemoryContextSwitchTo(), on_commit_wakeup_workers_subids, and TopTransactionContext.

Referenced by AlterObjectRename_internal(), AlterSubscription(), and AlterSubscriptionOwner_internal().

maybe_reread_subscription()

void maybe_reread_subscription

(

void

)

Definition at line 3954 of file worker.c.

{
    MemoryContext oldctx;
    Subscription *newsub;
    bool        started_tx = false;
 
    /* When cache state is valid there is nothing to do here. */
    if (MySubscriptionValid)
        return;
 
    /* This function might be called inside or outside of transaction. */
    if (!IsTransactionState())
    {
        StartTransactionCommand();
        started_tx = true;
    }
 
    /* Ensure allocations in permanent context. */
    oldctx = MemoryContextSwitchTo(ApplyContext);
 
    newsub = GetSubscription(MyLogicalRepWorker->subid, true);
 
    /*
     * Exit if the subscription was removed. This normally should not happen
     * as the worker gets killed during DROP SUBSCRIPTION.
     */
    if (!newsub)
    {
        ereport(LOG,
                (errmsg("logical replication worker for subscription \"%s\" will stop because the subscription was removed",
                        MySubscription->name)));
 
        /* Ensure we remove no-longer-useful entry for worker's start time */
        if (am_leader_apply_worker())
            ApplyLauncherForgetWorkerStartTime(MyLogicalRepWorker->subid);
 
        proc_exit(0);
    }
 
    /* Exit if the subscription was disabled. */
    if (!newsub->enabled)
    {
        ereport(LOG,
                (errmsg("logical replication worker for subscription \"%s\" will stop because the subscription was disabled",
                        MySubscription->name)));
 
        apply_worker_exit();
    }
 
    /* !slotname should never happen when enabled is true. */
    Assert(newsub->slotname);
 
    /* two-phase cannot be altered while the worker is running */
    Assert(newsub->twophasestate == MySubscription->twophasestate);
 
    /*
     * Exit if any parameter that affects the remote connection was changed.
     * The launcher will start a new worker but note that the parallel apply
     * worker won't restart if the streaming option's value is changed from
     * 'parallel' to any other value or the server decides not to stream the
     * in-progress transaction.
     */
    if (strcmp(newsub->conninfo, MySubscription->conninfo) != 0 ||
        strcmp(newsub->name, MySubscription->name) != 0 ||
        strcmp(newsub->slotname, MySubscription->slotname) != 0 ||
        newsub->binary != MySubscription->binary ||
        newsub->stream != MySubscription->stream ||
        newsub->passwordrequired != MySubscription->passwordrequired ||
        strcmp(newsub->origin, MySubscription->origin) != 0 ||
        newsub->owner != MySubscription->owner ||
        !equal(newsub->publications, MySubscription->publications))
    {
        if (am_parallel_apply_worker())
            ereport(LOG,
                    (errmsg("logical replication parallel apply worker for subscription \"%s\" will stop because of a parameter change",
                            MySubscription->name)));
        else
            ereport(LOG,
                    (errmsg("logical replication worker for subscription \"%s\" will restart because of a parameter change",
                            MySubscription->name)));
 
        apply_worker_exit();
    }
 
    /*
     * Exit if the subscription owner's superuser privileges have been
     * revoked.
     */
    if (!newsub->ownersuperuser && MySubscription->ownersuperuser)
    {
        if (am_parallel_apply_worker())
            ereport(LOG,
                    errmsg("logical replication parallel apply worker for subscription \"%s\" will stop because the subscription owner's superuser privileges have been revoked",
                           MySubscription->name));
        else
            ereport(LOG,
                    errmsg("logical replication worker for subscription \"%s\" will restart because the subscription owner's superuser privileges have been revoked",
                           MySubscription->name));
 
        apply_worker_exit();
    }
 
    /* Check for other changes that should never happen too. */
    if (newsub->dbid != MySubscription->dbid)
    {
        elog(ERROR, "subscription %u changed unexpectedly",
             MyLogicalRepWorker->subid);
    }
 
    /* Clean old subscription info and switch to new one. */
    FreeSubscription(MySubscription);
    MySubscription = newsub;
 
    MemoryContextSwitchTo(oldctx);
 
    /* Change synchronous commit according to the user's wishes */
    SetConfigOption("synchronous_commit", MySubscription->synccommit,
                    PGC_BACKEND, PGC_S_OVERRIDE);
 
    if (started_tx)
        CommitTransactionCommand();
 
    MySubscriptionValid = true;
}

References am_leader_apply_worker(), am_parallel_apply_worker(), apply_worker_exit(), ApplyContext, ApplyLauncherForgetWorkerStartTime(), Assert, Subscription::binary, CommitTransactionCommand(), Subscription::conninfo, Subscription::dbid, elog, equal(), ereport, errmsg(), ERROR, FreeSubscription(), GetSubscription(), IsTransactionState(), LOG, MemoryContextSwitchTo(), MyLogicalRepWorker, MySubscription, MySubscriptionValid, Subscription::name, newsub(), Subscription::origin, Subscription::owner, Subscription::ownersuperuser,