conflict.c File Reference

#include "postgres.h"
#include "access/commit_ts.h"
#include "access/tableam.h"
#include "executor/executor.h"
#include "pgstat.h"
#include "replication/conflict.h"
#include "replication/worker_internal.h"
#include "storage/lmgr.h"
#include "utils/lsyscache.h"

Include dependency graph for conflict.c:

Go to the source code of this file.

Functions
static int	errcode_apply_conflict (ConflictType type)
static int	errdetail_apply_conflict (EState *estate, ResultRelInfo *relinfo, ConflictType type, TupleTableSlot *searchslot, TupleTableSlot *localslot, TupleTableSlot *remoteslot, Oid indexoid, TransactionId localxmin, RepOriginId localorigin, TimestampTz localts)
static char *	build_tuple_value_details (EState *estate, ResultRelInfo *relinfo, ConflictType type, TupleTableSlot *searchslot, TupleTableSlot *localslot, TupleTableSlot *remoteslot, Oid indexoid)
static char *	build_index_value_desc (EState *estate, Relation localrel, TupleTableSlot *slot, Oid indexoid)
bool	GetTupleTransactionInfo (TupleTableSlot *localslot, TransactionId *xmin, RepOriginId *localorigin, TimestampTz *localts)
void	ReportApplyConflict (EState *estate, ResultRelInfo *relinfo, int elevel, ConflictType type, TupleTableSlot *searchslot, TupleTableSlot *localslot, TupleTableSlot *remoteslot, Oid indexoid, TransactionId localxmin, RepOriginId localorigin, TimestampTz localts)
void	InitConflictIndexes (ResultRelInfo *relInfo)

Variables
static const char *const	ConflictTypeNames []

Function Documentation

build_index_value_desc()

static char * build_index_value_desc ( EState *  estate, Relation  localrel, TupleTableSlot *  slot, Oid  indexoid  )

static

Definition at line 447 of file conflict.c.

{
    char       *index_value;
    Relation    indexDesc;
    Datum       values[INDEX_MAX_KEYS];
    bool        isnull[INDEX_MAX_KEYS];
    TupleTableSlot *tableslot = slot;
 
    if (!tableslot)
        return NULL;
 
    Assert(CheckRelationOidLockedByMe(indexoid, RowExclusiveLock, true));
 
    indexDesc = index_open(indexoid, NoLock);
 
    /*
     * If the slot is a virtual slot, copy it into a heap tuple slot as
     * FormIndexDatum only works with heap tuple slots.
     */
    if (TTS_IS_VIRTUAL(slot))
    {
        tableslot = table_slot_create(localrel, &estate->es_tupleTable);
        tableslot = ExecCopySlot(tableslot, slot);
    }
 
    /*
     * Initialize ecxt_scantuple for potential use in FormIndexDatum when
     * index expressions are present.
     */
    GetPerTupleExprContext(estate)->ecxt_scantuple = tableslot;
 
    /*
     * The values/nulls arrays passed to BuildIndexValueDescription should be
     * the results of FormIndexDatum, which are the "raw" input to the index
     * AM.
     */
    FormIndexDatum(BuildIndexInfo(indexDesc), tableslot, estate, values, isnull);
 
    index_value = BuildIndexValueDescription(indexDesc, values, isnull);
 
    index_close(indexDesc, NoLock);
 
    return index_value;
}

References Assert, BuildIndexInfo(), BuildIndexValueDescription(), CheckRelationOidLockedByMe(), EState::es_tupleTable, ExecCopySlot(), FormIndexDatum(), GetPerTupleExprContext, index_close(), INDEX_MAX_KEYS, index_open(), NoLock, RowExclusiveLock, table_slot_create(), TTS_IS_VIRTUAL, and values.

Referenced by build_tuple_value_details().

build_tuple_value_details()

static char * build_tuple_value_details ( EState *  estate, ResultRelInfo *  relinfo, ConflictType  type, TupleTableSlot *  searchslot, TupleTableSlot *  localslot, TupleTableSlot *  remoteslot, Oid  indexoid  )

static

Definition at line 305 of file conflict.c.

{
    Relation    localrel = relinfo->ri_RelationDesc;
    Oid         relid = RelationGetRelid(localrel);
    TupleDesc   tupdesc = RelationGetDescr(localrel);
    StringInfoData tuple_value;
    char       *desc = NULL;
 
    Assert(searchslot || localslot || remoteslot);
 
    initStringInfo(&tuple_value);
 
    /*
     * Report the conflicting key values in the case of a unique constraint
     * violation.
     */
    if (type == CT_INSERT_EXISTS || type == CT_UPDATE_EXISTS)
    {
        Assert(OidIsValid(indexoid) && localslot);
 
        desc = build_index_value_desc(estate, localrel, localslot, indexoid);
 
        if (desc)
            appendStringInfo(&tuple_value, _("Key %s"), desc);
    }
 
    if (localslot)
    {
        /*
         * The 'modifiedCols' only applies to the new tuple, hence we pass
         * NULL for the existing local tuple.
         */
        desc = ExecBuildSlotValueDescription(relid, localslot, tupdesc,
                                             NULL, 64);
 
        if (desc)
        {
            if (tuple_value.len > 0)
            {
                appendStringInfoString(&tuple_value, "; ");
                appendStringInfo(&tuple_value, _("existing local tuple %s"),
                                 desc);
            }
            else
            {
                appendStringInfo(&tuple_value, _("Existing local tuple %s"),
                                 desc);
            }
        }
    }
 
    if (remoteslot)
    {
        Bitmapset  *modifiedCols;
 
        /*
         * Although logical replication doesn't maintain the bitmap for the
         * columns being inserted, we still use it to create 'modifiedCols'
         * for consistency with other calls to ExecBuildSlotValueDescription.
         *
         * Note that generated columns are formed locally on the subscriber.
         */
        modifiedCols = bms_union(ExecGetInsertedCols(relinfo, estate),
                                 ExecGetUpdatedCols(relinfo, estate));
        desc = ExecBuildSlotValueDescription(relid, remoteslot, tupdesc,
                                             modifiedCols, 64);
 
        if (desc)
        {
            if (tuple_value.len > 0)
            {
                appendStringInfoString(&tuple_value, "; ");
                appendStringInfo(&tuple_value, _("remote tuple %s"), desc);
            }
            else
            {
                appendStringInfo(&tuple_value, _("Remote tuple %s"), desc);
            }
        }
    }
 
    if (searchslot)
    {
        /*
         * Note that while index other than replica identity may be used (see
         * IsIndexUsableForReplicaIdentityFull for details) to find the tuple
         * when applying update or delete, such an index scan may not result
         * in a unique tuple and we still compare the complete tuple in such
         * cases, thus such indexes are not used here.
         */
        Oid         replica_index = GetRelationIdentityOrPK(localrel);
 
        Assert(type != CT_INSERT_EXISTS);
 
        /*
         * If the table has a valid replica identity index, build the index
         * key value string. Otherwise, construct the full tuple value for
         * REPLICA IDENTITY FULL cases.
         */
        if (OidIsValid(replica_index))
            desc = build_index_value_desc(estate, localrel, searchslot, replica_index);
        else
            desc = ExecBuildSlotValueDescription(relid, searchslot, tupdesc, NULL, 64);
 
        if (desc)
        {
            if (tuple_value.len > 0)
            {
                appendStringInfoString(&tuple_value, "; ");
                appendStringInfo(&tuple_value, OidIsValid(replica_index)
                                 ? _("replica identity %s")
                                 : _("replica identity full %s"), desc);
            }
            else
            {
                appendStringInfo(&tuple_value, OidIsValid(replica_index)
                                 ? _("Replica identity %s")
                                 : _("Replica identity full %s"), desc);
            }
        }
    }
 
    if (tuple_value.len == 0)
        return NULL;
 
    appendStringInfoChar(&tuple_value, '.');
    return tuple_value.data;
}

References _, appendStringInfo(), appendStringInfoChar(), appendStringInfoString(), Assert, bms_union(), build_index_value_desc(), CT_INSERT_EXISTS, CT_UPDATE_EXISTS, StringInfoData::data, ExecBuildSlotValueDescription(), ExecGetInsertedCols(), ExecGetUpdatedCols(), GetRelationIdentityOrPK(), initStringInfo(), StringInfoData::len, OidIsValid, RelationGetDescr, RelationGetRelid, ResultRelInfo::ri_RelationDesc, and type.

Referenced by errdetail_apply_conflict().

errcode_apply_conflict()

static int errcode_apply_conflict ( ConflictType  type )

static

Definition at line 166 of file conflict.c.

{
    switch (type)
    {
        case CT_INSERT_EXISTS:
        case CT_UPDATE_EXISTS:
            return errcode(ERRCODE_UNIQUE_VIOLATION);
        case CT_UPDATE_ORIGIN_DIFFERS:
        case CT_UPDATE_MISSING:
        case CT_DELETE_ORIGIN_DIFFERS:
        case CT_DELETE_MISSING:
            return errcode(ERRCODE_T_R_SERIALIZATION_FAILURE);
    }
 
    Assert(false);
    return 0;                   /* silence compiler warning */
}

References Assert, CT_DELETE_MISSING, CT_DELETE_ORIGIN_DIFFERS, CT_INSERT_EXISTS, CT_UPDATE_EXISTS, CT_UPDATE_MISSING, CT_UPDATE_ORIGIN_DIFFERS, errcode(), ERRCODE_T_R_SERIALIZATION_FAILURE, and type.

Referenced by ReportApplyConflict().

errdetail_apply_conflict()

static int errdetail_apply_conflict ( EState *  estate, ResultRelInfo *  relinfo, ConflictType  type, TupleTableSlot *  searchslot, TupleTableSlot *  localslot, TupleTableSlot *  remoteslot, Oid  indexoid, TransactionId  localxmin, RepOriginId  localorigin, TimestampTz  localts  )

static

Definition at line 195 of file conflict.c.

{
    StringInfoData err_detail;
    char       *val_desc;
    char       *origin_name;
 
    initStringInfo(&err_detail);
 
    /* First, construct a detailed message describing the type of conflict */
    switch (type)
    {
        case CT_INSERT_EXISTS:
        case CT_UPDATE_EXISTS:
            Assert(OidIsValid(indexoid));
 
            if (localts)
            {
                if (localorigin == InvalidRepOriginId)
                    appendStringInfo(&err_detail, _("Key already exists in unique index \"%s\", modified locally in transaction %u at %s."),
                                     get_rel_name(indexoid),
                                     localxmin, timestamptz_to_str(localts));
                else if (replorigin_by_oid(localorigin, true, &origin_name))
                    appendStringInfo(&err_detail, _("Key already exists in unique index \"%s\", modified by origin \"%s\" in transaction %u at %s."),
                                     get_rel_name(indexoid), origin_name,
                                     localxmin, timestamptz_to_str(localts));
 
                /*
                 * The origin that modified this row has been removed. This
                 * can happen if the origin was created by a different apply
                 * worker and its associated subscription and origin were
                 * dropped after updating the row, or if the origin was
                 * manually dropped by the user.
                 */
                else
                    appendStringInfo(&err_detail, _("Key already exists in unique index \"%s\", modified by a non-existent origin in transaction %u at %s."),
                                     get_rel_name(indexoid),
                                     localxmin, timestamptz_to_str(localts));
            }
            else
                appendStringInfo(&err_detail, _("Key already exists in unique index \"%s\", modified in transaction %u."),
                                 get_rel_name(indexoid), localxmin);
 
            break;
 
        case CT_UPDATE_ORIGIN_DIFFERS:
            if (localorigin == InvalidRepOriginId)
                appendStringInfo(&err_detail, _("Updating the row that was modified locally in transaction %u at %s."),
                                 localxmin, timestamptz_to_str(localts));
            else if (replorigin_by_oid(localorigin, true, &origin_name))
                appendStringInfo(&err_detail, _("Updating the row that was modified by a different origin \"%s\" in transaction %u at %s."),
                                 origin_name, localxmin, timestamptz_to_str(localts));
 
            /* The origin that modified this row has been removed. */
            else
                appendStringInfo(&err_detail, _("Updating the row that was modified by a non-existent origin in transaction %u at %s."),
                                 localxmin, timestamptz_to_str(localts));
 
            break;
 
        case CT_UPDATE_MISSING:
            appendStringInfo(&err_detail, _("Could not find the row to be updated."));
            break;
 
        case CT_DELETE_ORIGIN_DIFFERS:
            if (localorigin == InvalidRepOriginId)
                appendStringInfo(&err_detail, _("Deleting the row that was modified locally in transaction %u at %s."),
                                 localxmin, timestamptz_to_str(localts));
            else if (replorigin_by_oid(localorigin, true, &origin_name))
                appendStringInfo(&err_detail, _("Deleting the row that was modified by a different origin \"%s\" in transaction %u at %s."),
                                 origin_name, localxmin, timestamptz_to_str(localts));
 
            /* The origin that modified this row has been removed. */
            else
                appendStringInfo(&err_detail, _("Deleting the row that was modified by a non-existent origin in transaction %u at %s."),
                                 localxmin, timestamptz_to_str(localts));
 
            break;
 
        case CT_DELETE_MISSING:
            appendStringInfo(&err_detail, _("Could not find the row to be deleted."));
            break;
    }
 
    Assert(err_detail.len > 0);
 
    val_desc = build_tuple_value_details(estate, relinfo, type, searchslot,
                                         localslot, remoteslot, indexoid);
 
    /*
     * Next, append the key values, existing local tuple, remote tuple and
     * replica identity columns after the message.
     */
    if (val_desc)
        appendStringInfo(&err_detail, "\n%s", val_desc);
 
    return errdetail_internal("%s", err_detail.data);
}

References _, appendStringInfo(), Assert, build_tuple_value_details(), CT_DELETE_MISSING, CT_DELETE_ORIGIN_DIFFERS, CT_INSERT_EXISTS, CT_UPDATE_EXISTS, CT_UPDATE_MISSING, CT_UPDATE_ORIGIN_DIFFERS, StringInfoData::data, errdetail_internal(), get_rel_name(), initStringInfo(), InvalidRepOriginId, StringInfoData::len, OidIsValid, replorigin_by_oid(), timestamptz_to_str(), and type.

Referenced by ReportApplyConflict().

GetTupleTransactionInfo()

bool GetTupleTransactionInfo	(	TupleTableSlot *	localslot,
		TransactionId *	xmin,
		RepOriginId *	localorigin,
		TimestampTz *	localts
	)

Definition at line 61 of file conflict.c.

{
    Datum       xminDatum;
    bool        isnull;
 
    xminDatum = slot_getsysattr(localslot, MinTransactionIdAttributeNumber,
                                &isnull);
    *xmin = DatumGetTransactionId(xminDatum);
    Assert(!isnull);
 
    /*
     * The commit timestamp data is not available if track_commit_timestamp is
     * disabled.
     */
    if (!track_commit_timestamp)
    {
        *localorigin = InvalidRepOriginId;
        *localts = 0;
        return false;
    }
 
    return TransactionIdGetCommitTsData(*xmin, localts, localorigin);
}

References Assert, DatumGetTransactionId(), InvalidRepOriginId, MinTransactionIdAttributeNumber, slot_getsysattr(), track_commit_timestamp, and TransactionIdGetCommitTsData().

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

InitConflictIndexes()

void InitConflictIndexes

(

ResultRelInfo *

relInfo

)

Definition at line 136 of file conflict.c.

{
    List       *uniqueIndexes = NIL;
 
    for (int i = 0; i < relInfo->ri_NumIndices; i++)
    {
        Relation    indexRelation = relInfo->ri_IndexRelationDescs[i];
 
        if (indexRelation == NULL)
            continue;
 
        /* Detect conflict only for unique indexes */
        if (!relInfo->ri_IndexRelationInfo[i]->ii_Unique)
            continue;
 
        /* Don't support conflict detection for deferrable index */
        if (!indexRelation->rd_index->indimmediate)
            continue;
 
        uniqueIndexes = lappend_oid(uniqueIndexes,
                                    RelationGetRelid(indexRelation));
    }
 
    relInfo->ri_onConflictArbiterIndexes = uniqueIndexes;
}

References i, IndexInfo::ii_Unique, lappend_oid(), NIL, RelationData::rd_index, RelationGetRelid, ResultRelInfo::ri_IndexRelationDescs, ResultRelInfo::ri_IndexRelationInfo, ResultRelInfo::ri_NumIndices, and ResultRelInfo::ri_onConflictArbiterIndexes.

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

ReportApplyConflict()

void ReportApplyConflict	(	EState *	estate,
		ResultRelInfo *	relinfo,
		int	elevel,
		ConflictType	type,
		TupleTableSlot *	searchslot,
		TupleTableSlot *	localslot,
		TupleTableSlot *	remoteslot,
		Oid	indexoid,
		TransactionId	localxmin,
		RepOriginId	localorigin,
		TimestampTz	localts
	)

Definition at line 107 of file conflict.c.

{
    Relation    localrel = relinfo->ri_RelationDesc;
 
    Assert(!OidIsValid(indexoid) ||
           CheckRelationOidLockedByMe(indexoid, RowExclusiveLock, true));
 
    pgstat_report_subscription_conflict(MySubscription->oid, type);
 
    ereport(elevel,
            errcode_apply_conflict(type),
            errmsg("conflict detected on relation \"%s.%s\": conflict=%s",
                   get_namespace_name(RelationGetNamespace(localrel)),
                   RelationGetRelationName(localrel),
                   ConflictTypeNames[type]),
            errdetail_apply_conflict(estate, relinfo, type, searchslot,
                                     localslot, remoteslot, indexoid,
                                     localxmin, localorigin, localts));
}

References Assert, CheckRelationOidLockedByMe(), ConflictTypeNames, ereport, errcode_apply_conflict(), errdetail_apply_conflict(), errmsg(), get_namespace_name(), MySubscription, Subscription::oid, OidIsValid, pgstat_report_subscription_conflict(), RelationGetNamespace, RelationGetRelationName, ResultRelInfo::ri_RelationDesc, RowExclusiveLock, and type.

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

Variable Documentation

ConflictTypeNames

const char* const ConflictTypeNames[]

static

Initial value:

= {
    [CT_INSERT_EXISTS] = "insert_exists",
    [CT_UPDATE_ORIGIN_DIFFERS] = "update_origin_differs",
    [CT_UPDATE_EXISTS] = "update_exists",
    [CT_UPDATE_MISSING] = "update_missing",
    [CT_DELETE_ORIGIN_DIFFERS] = "delete_origin_differs",
    [CT_DELETE_MISSING] = "delete_missing"
}

Definition at line 26 of file conflict.c.

Referenced by ReportApplyConflict().