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logical.h File Reference
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Data Structures

struct  LogicalDecodingContext
 

Typedefs

typedef void(* LogicalOutputPluginWriterWrite )(struct LogicalDecodingContext *lr, XLogRecPtr Ptr, TransactionId xid, bool last_write)
 
typedef
LogicalOutputPluginWriterWrite 
LogicalOutputPluginWriterPrepareWrite
 
typedef void(* LogicalOutputPluginWriterUpdateProgress )(struct LogicalDecodingContext *lr, XLogRecPtr Ptr, TransactionId xid)
 
typedef struct
LogicalDecodingContext 
LogicalDecodingContext
 

Functions

void CheckLogicalDecodingRequirements (void)
 
LogicalDecodingContextCreateInitDecodingContext (char *plugin, List *output_plugin_options, bool need_full_snapshot, XLogPageReadCB read_page, LogicalOutputPluginWriterPrepareWrite prepare_write, LogicalOutputPluginWriterWrite do_write, LogicalOutputPluginWriterUpdateProgress update_progress)
 
LogicalDecodingContextCreateDecodingContext (XLogRecPtr start_lsn, List *output_plugin_options, XLogPageReadCB read_page, LogicalOutputPluginWriterPrepareWrite prepare_write, LogicalOutputPluginWriterWrite do_write, LogicalOutputPluginWriterUpdateProgress update_progress)
 
void DecodingContextFindStartpoint (LogicalDecodingContext *ctx)
 
bool DecodingContextReady (LogicalDecodingContext *ctx)
 
void FreeDecodingContext (LogicalDecodingContext *ctx)
 
void LogicalIncreaseXminForSlot (XLogRecPtr lsn, TransactionId xmin)
 
void LogicalIncreaseRestartDecodingForSlot (XLogRecPtr current_lsn, XLogRecPtr restart_lsn)
 
void LogicalConfirmReceivedLocation (XLogRecPtr lsn)
 
bool filter_by_origin_cb_wrapper (LogicalDecodingContext *ctx, RepOriginId origin_id)
 

Typedef Documentation

typedef void(* LogicalOutputPluginWriterUpdateProgress)(struct LogicalDecodingContext *lr, XLogRecPtr Ptr, TransactionId xid)

Definition at line 29 of file logical.h.

typedef void(* LogicalOutputPluginWriterWrite)(struct LogicalDecodingContext *lr, XLogRecPtr Ptr, TransactionId xid, bool last_write)

Definition at line 20 of file logical.h.

Function Documentation

void CheckLogicalDecodingRequirements ( void  )

Definition at line 76 of file logical.c.

References CheckSlotRequirements(), ereport, errcode(), errmsg(), ERROR, InvalidOid, MyDatabaseId, RecoveryInProgress(), wal_level, and WAL_LEVEL_LOGICAL.

Referenced by CreateReplicationSlot(), pg_create_logical_replication_slot(), pg_logical_slot_get_changes_guts(), and StartLogicalReplication().

77 {
79 
81  ereport(ERROR,
82  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
83  errmsg("logical decoding requires wal_level >= logical")));
84 
85  if (MyDatabaseId == InvalidOid)
86  ereport(ERROR,
87  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
88  errmsg("logical decoding requires a database connection")));
89 
90  /* ----
91  * TODO: We got to change that someday soon...
92  *
93  * There's basically three things missing to allow this:
94  * 1) We need to be able to correctly and quickly identify the timeline a
95  * LSN belongs to
96  * 2) We need to force hot_standby_feedback to be enabled at all times so
97  * the primary cannot remove rows we need.
98  * 3) support dropping replication slots referring to a database, in
99  * dbase_redo. There can't be any active ones due to HS recovery
100  * conflicts, so that should be relatively easy.
101  * ----
102  */
103  if (RecoveryInProgress())
104  ereport(ERROR,
105  (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
106  errmsg("logical decoding cannot be used while in recovery")));
107 }
void CheckSlotRequirements(void)
Definition: slot.c:965
int wal_level
Definition: xlog.c:104
int errcode(int sqlerrcode)
Definition: elog.c:575
bool RecoveryInProgress(void)
Definition: xlog.c:7962
#define ERROR
Definition: elog.h:43
#define ereport(elevel, rest)
Definition: elog.h:122
Oid MyDatabaseId
Definition: globals.c:77
#define InvalidOid
Definition: postgres_ext.h:36
int errmsg(const char *fmt,...)
Definition: elog.c:797
LogicalDecodingContext* CreateDecodingContext ( XLogRecPtr  start_lsn,
List output_plugin_options,
XLogPageReadCB  read_page,
LogicalOutputPluginWriterPrepareWrite  prepare_write,
LogicalOutputPluginWriterWrite  do_write,
LogicalOutputPluginWriterUpdateProgress  update_progress 
)

Definition at line 343 of file logical.c.

References LogicalDecodingContext::callbacks, ReplicationSlotPersistentData::confirmed_flush, LogicalDecodingContext::context, ReplicationSlot::data, ReplicationSlotPersistentData::database, DEBUG1, elog, ereport, errcode(), errdetail(), errmsg(), ERROR, InvalidTransactionId, InvalidXLogRecPtr, LOG, MemoryContextSwitchTo(), MyDatabaseId, MyReplicationSlot, ReplicationSlotPersistentData::name, NameStr, LogicalDecodingContext::options, ReplicationSlotPersistentData::restart_lsn, SlotIsPhysical, OutputPluginCallbacks::startup_cb, startup_cb_wrapper(), and StartupDecodingContext().

Referenced by pg_logical_slot_get_changes_guts(), and StartLogicalReplication().

349 {
351  ReplicationSlot *slot;
352  MemoryContext old_context;
353 
354  /* shorter lines... */
355  slot = MyReplicationSlot;
356 
357  /* first some sanity checks that are unlikely to be violated */
358  if (slot == NULL)
359  elog(ERROR, "cannot perform logical decoding without an acquired slot");
360 
361  /* make sure the passed slot is suitable, these are user facing errors */
362  if (SlotIsPhysical(slot))
363  ereport(ERROR,
364  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
365  (errmsg("cannot use physical replication slot for logical decoding"))));
366 
367  if (slot->data.database != MyDatabaseId)
368  ereport(ERROR,
369  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
370  (errmsg("replication slot \"%s\" was not created in this database",
371  NameStr(slot->data.name)))));
372 
373  if (start_lsn == InvalidXLogRecPtr)
374  {
375  /* continue from last position */
376  start_lsn = slot->data.confirmed_flush;
377  }
378  else if (start_lsn < slot->data.confirmed_flush)
379  {
380  /*
381  * It might seem like we should error out in this case, but it's
382  * pretty common for a client to acknowledge a LSN it doesn't have to
383  * do anything for, and thus didn't store persistently, because the
384  * xlog records didn't result in anything relevant for logical
385  * decoding. Clients have to be able to do that to support synchronous
386  * replication.
387  */
388  elog(DEBUG1, "cannot stream from %X/%X, minimum is %X/%X, forwarding",
389  (uint32) (start_lsn >> 32), (uint32) start_lsn,
390  (uint32) (slot->data.confirmed_flush >> 32),
391  (uint32) slot->data.confirmed_flush);
392 
393  start_lsn = slot->data.confirmed_flush;
394  }
395 
396  ctx = StartupDecodingContext(output_plugin_options,
397  start_lsn, InvalidTransactionId, false,
398  read_page, prepare_write, do_write,
399  update_progress);
400 
401  /* call output plugin initialization callback */
402  old_context = MemoryContextSwitchTo(ctx->context);
403  if (ctx->callbacks.startup_cb != NULL)
404  startup_cb_wrapper(ctx, &ctx->options, false);
405  MemoryContextSwitchTo(old_context);
406 
407  ereport(LOG,
408  (errmsg("starting logical decoding for slot \"%s\"",
409  NameStr(slot->data.name)),
410  errdetail("streaming transactions committing after %X/%X, reading WAL from %X/%X",
411  (uint32) (slot->data.confirmed_flush >> 32),
412  (uint32) slot->data.confirmed_flush,
413  (uint32) (slot->data.restart_lsn >> 32),
414  (uint32) slot->data.restart_lsn)));
415 
416  return ctx;
417 }
#define InvalidXLogRecPtr
Definition: xlogdefs.h:28
#define DEBUG1
Definition: elog.h:25
OutputPluginOptions options
Definition: logical.h:49
OutputPluginCallbacks callbacks
Definition: logical.h:48
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
int errcode(int sqlerrcode)
Definition: elog.c:575
MemoryContext context
Definition: logical.h:38
ReplicationSlotPersistentData data
Definition: slot.h:120
#define LOG
Definition: elog.h:26
#define SlotIsPhysical(slot)
Definition: slot.h:141
XLogRecPtr confirmed_flush
Definition: slot.h:81
static LogicalDecodingContext * StartupDecodingContext(List *output_plugin_options, XLogRecPtr start_lsn, TransactionId xmin_horizon, bool need_full_snapshot, XLogPageReadCB read_page, LogicalOutputPluginWriterPrepareWrite prepare_write, LogicalOutputPluginWriterWrite do_write, LogicalOutputPluginWriterUpdateProgress update_progress)
Definition: logical.c:114
#define ERROR
Definition: elog.h:43
static void startup_cb_wrapper(LogicalDecodingContext *ctx, OutputPluginOptions *opt, bool is_init)
Definition: logical.c:571
int errdetail(const char *fmt,...)
Definition: elog.c:873
#define InvalidTransactionId
Definition: transam.h:31
unsigned int uint32
Definition: c.h:258
#define ereport(elevel, rest)
Definition: elog.h:122
Oid MyDatabaseId
Definition: globals.c:77
ReplicationSlot * MyReplicationSlot
Definition: slot.c:96
XLogRecPtr restart_lsn
Definition: slot.h:73
LogicalDecodeStartupCB startup_cb
Definition: output_plugin.h:97
int errmsg(const char *fmt,...)
Definition: elog.c:797
#define NameStr(name)
Definition: c.h:493
#define elog
Definition: elog.h:219
LogicalDecodingContext* CreateInitDecodingContext ( char *  plugin,
List output_plugin_options,
bool  need_full_snapshot,
XLogPageReadCB  read_page,
LogicalOutputPluginWriterPrepareWrite  prepare_write,
LogicalOutputPluginWriterWrite  do_write,
LogicalOutputPluginWriterUpdateProgress  update_progress 
)

Definition at line 216 of file logical.c.

References LogicalDecodingContext::callbacks, ReplicationSlotPersistentData::catalog_xmin, LogicalDecodingContext::context, ReplicationSlot::data, ReplicationSlotPersistentData::database, ReplicationSlot::effective_catalog_xmin, ReplicationSlot::effective_xmin, elog, ereport, errcode(), errmsg(), ERROR, GetOldestSafeDecodingTransactionId(), GetTopTransactionIdIfAny(), InvalidTransactionId, InvalidXLogRecPtr, IsTransactionState(), LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), MemoryContextSwitchTo(), ReplicationSlot::mutex, MyDatabaseId, MyReplicationSlot, ReplicationSlotPersistentData::name, NAMEDATALEN, NameStr, NIL, LogicalDecodingContext::options, ReplicationSlotPersistentData::plugin, ReplicationSlotMarkDirty(), ReplicationSlotReserveWal(), ReplicationSlotSave(), ReplicationSlotsComputeRequiredXmin(), SlotIsPhysical, SpinLockAcquire, SpinLockRelease, OutputPluginCallbacks::startup_cb, startup_cb_wrapper(), StartupDecodingContext(), and StrNCpy.

Referenced by CreateReplicationSlot(), and pg_create_logical_replication_slot().

223 {
224  TransactionId xmin_horizon = InvalidTransactionId;
225  ReplicationSlot *slot;
227  MemoryContext old_context;
228 
229  /* shorter lines... */
230  slot = MyReplicationSlot;
231 
232  /* first some sanity checks that are unlikely to be violated */
233  if (slot == NULL)
234  elog(ERROR, "cannot perform logical decoding without an acquired slot");
235 
236  if (plugin == NULL)
237  elog(ERROR, "cannot initialize logical decoding without a specified plugin");
238 
239  /* Make sure the passed slot is suitable. These are user facing errors. */
240  if (SlotIsPhysical(slot))
241  ereport(ERROR,
242  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
243  errmsg("cannot use physical replication slot for logical decoding")));
244 
245  if (slot->data.database != MyDatabaseId)
246  ereport(ERROR,
247  (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
248  errmsg("replication slot \"%s\" was not created in this database",
249  NameStr(slot->data.name))));
250 
251  if (IsTransactionState() &&
253  ereport(ERROR,
254  (errcode(ERRCODE_ACTIVE_SQL_TRANSACTION),
255  errmsg("cannot create logical replication slot in transaction that has performed writes")));
256 
257  /* register output plugin name with slot */
258  SpinLockAcquire(&slot->mutex);
260  SpinLockRelease(&slot->mutex);
261 
263 
264  /* ----
265  * This is a bit tricky: We need to determine a safe xmin horizon to start
266  * decoding from, to avoid starting from a running xacts record referring
267  * to xids whose rows have been vacuumed or pruned
268  * already. GetOldestSafeDecodingTransactionId() returns such a value, but
269  * without further interlock its return value might immediately be out of
270  * date.
271  *
272  * So we have to acquire the ProcArrayLock to prevent computation of new
273  * xmin horizons by other backends, get the safe decoding xid, and inform
274  * the slot machinery about the new limit. Once that's done the
275  * ProcArrayLock can be released as the slot machinery now is
276  * protecting against vacuum.
277  *
278  * Note that, temporarily, the data, not just the catalog, xmin has to be
279  * reserved if a data snapshot is to be exported. Otherwise the initial
280  * data snapshot created here is not guaranteed to be valid. After that
281  * the data xmin doesn't need to be managed anymore and the global xmin
282  * should be recomputed. As we are fine with losing the pegged data xmin
283  * after crash - no chance a snapshot would get exported anymore - we can
284  * get away with just setting the slot's
285  * effective_xmin. ReplicationSlotRelease will reset it again.
286  *
287  * ----
288  */
289  LWLockAcquire(ProcArrayLock, LW_EXCLUSIVE);
290 
291  xmin_horizon = GetOldestSafeDecodingTransactionId(!need_full_snapshot);
292 
293  slot->effective_catalog_xmin = xmin_horizon;
294  slot->data.catalog_xmin = xmin_horizon;
295  if (need_full_snapshot)
296  slot->effective_xmin = xmin_horizon;
297 
299 
300  LWLockRelease(ProcArrayLock);
301 
304 
305  ctx = StartupDecodingContext(NIL, InvalidXLogRecPtr, xmin_horizon,
306  need_full_snapshot, read_page, prepare_write,
307  do_write, update_progress);
308 
309  /* call output plugin initialization callback */
310  old_context = MemoryContextSwitchTo(ctx->context);
311  if (ctx->callbacks.startup_cb != NULL)
312  startup_cb_wrapper(ctx, &ctx->options, true);
313  MemoryContextSwitchTo(old_context);
314 
315  return ctx;
316 }
#define NIL
Definition: pg_list.h:69
static const char * plugin
#define InvalidXLogRecPtr
Definition: xlogdefs.h:28
TransactionId GetOldestSafeDecodingTransactionId(bool catalogOnly)
Definition: procarray.c:2158
uint32 TransactionId
Definition: c.h:391
OutputPluginOptions options
Definition: logical.h:49
OutputPluginCallbacks callbacks
Definition: logical.h:48
static MemoryContext MemoryContextSwitchTo(MemoryContext context)
Definition: palloc.h:109
int errcode(int sqlerrcode)
Definition: elog.c:575
MemoryContext context
Definition: logical.h:38
void ReplicationSlotSave(void)
Definition: slot.c:638
ReplicationSlotPersistentData data
Definition: slot.h:120
#define SlotIsPhysical(slot)
Definition: slot.h:141
static LogicalDecodingContext * StartupDecodingContext(List *output_plugin_options, XLogRecPtr start_lsn, TransactionId xmin_horizon, bool need_full_snapshot, XLogPageReadCB read_page, LogicalOutputPluginWriterPrepareWrite prepare_write, LogicalOutputPluginWriterWrite do_write, LogicalOutputPluginWriterUpdateProgress update_progress)
Definition: logical.c:114
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1721
#define NAMEDATALEN
#define SpinLockAcquire(lock)
Definition: spin.h:62
void ReplicationSlotReserveWal(void)
Definition: slot.c:985
#define ERROR
Definition: elog.h:43
static void startup_cb_wrapper(LogicalDecodingContext *ctx, OutputPluginOptions *opt, bool is_init)
Definition: logical.c:571
TransactionId effective_xmin
Definition: slot.h:116
TransactionId catalog_xmin
Definition: slot.h:70
#define InvalidTransactionId
Definition: transam.h:31
TransactionId GetTopTransactionIdIfAny(void)
Definition: xact.c:405
#define ereport(elevel, rest)
Definition: elog.h:122
#define SpinLockRelease(lock)
Definition: spin.h:64
TransactionId effective_catalog_xmin
Definition: slot.h:117
Oid MyDatabaseId
Definition: globals.c:77
ReplicationSlot * MyReplicationSlot
Definition: slot.c:96
#define StrNCpy(dst, src, len)
Definition: c.h:819
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1117
bool IsTransactionState(void)
Definition: xact.c:351
LogicalDecodeStartupCB startup_cb
Definition: output_plugin.h:97
int errmsg(const char *fmt,...)
Definition: elog.c:797
#define NameStr(name)
Definition: c.h:493
#define elog
Definition: elog.h:219
slock_t mutex
Definition: slot.h:93
void ReplicationSlotsComputeRequiredXmin(bool already_locked)
Definition: slot.c:695
void ReplicationSlotMarkDirty(void)
Definition: slot.c:656
void DecodingContextFindStartpoint ( LogicalDecodingContext ctx)

Definition at line 432 of file logical.c.

References CHECK_FOR_INTERRUPTS, ReplicationSlotPersistentData::confirmed_flush, ReplicationSlot::data, DEBUG1, DecodingContextReady(), elog, XLogReaderState::EndRecPtr, ERROR, InvalidXLogRecPtr, LogicalDecodingProcessRecord(), LogicalDecodingContext::reader, ReplicationSlotPersistentData::restart_lsn, LogicalDecodingContext::slot, and XLogReadRecord().

Referenced by CreateReplicationSlot(), and pg_create_logical_replication_slot().

433 {
434  XLogRecPtr startptr;
435 
436  /* Initialize from where to start reading WAL. */
437  startptr = ctx->slot->data.restart_lsn;
438 
439  elog(DEBUG1, "searching for logical decoding starting point, starting at %X/%X",
440  (uint32) (ctx->slot->data.restart_lsn >> 32),
441  (uint32) ctx->slot->data.restart_lsn);
442 
443  /* Wait for a consistent starting point */
444  for (;;)
445  {
446  XLogRecord *record;
447  char *err = NULL;
448 
449  /* the read_page callback waits for new WAL */
450  record = XLogReadRecord(ctx->reader, startptr, &err);
451  if (err)
452  elog(ERROR, "%s", err);
453  if (!record)
454  elog(ERROR, "no record found"); /* shouldn't happen */
455 
456  startptr = InvalidXLogRecPtr;
457 
459 
460  /* only continue till we found a consistent spot */
461  if (DecodingContextReady(ctx))
462  break;
463 
465  }
466 
467  ctx->slot->data.confirmed_flush = ctx->reader->EndRecPtr;
468 }
#define InvalidXLogRecPtr
Definition: xlogdefs.h:28
#define DEBUG1
Definition: elog.h:25
bool DecodingContextReady(LogicalDecodingContext *ctx)
Definition: logical.c:423
ReplicationSlotPersistentData data
Definition: slot.h:120
XLogRecord * XLogReadRecord(XLogReaderState *state, XLogRecPtr RecPtr, char **errormsg)
Definition: xlogreader.c:195
XLogRecPtr confirmed_flush
Definition: slot.h:81
XLogRecPtr EndRecPtr
Definition: xlogreader.h:120
#define ERROR
Definition: elog.h:43
void LogicalDecodingProcessRecord(LogicalDecodingContext *ctx, XLogReaderState *record)
Definition: decode.c:93
unsigned int uint32
Definition: c.h:258
uint64 XLogRecPtr
Definition: xlogdefs.h:21
XLogRecPtr restart_lsn
Definition: slot.h:73
XLogReaderState * reader
Definition: logical.h:44
ReplicationSlot * slot
Definition: logical.h:41
#define CHECK_FOR_INTERRUPTS()
Definition: miscadmin.h:98
#define elog
Definition: elog.h:219
bool DecodingContextReady ( LogicalDecodingContext ctx)

Definition at line 423 of file logical.c.

References SNAPBUILD_CONSISTENT, SnapBuildCurrentState(), and LogicalDecodingContext::snapshot_builder.

Referenced by DecodingContextFindStartpoint().

424 {
426 }
SnapBuildState SnapBuildCurrentState(SnapBuild *builder)
Definition: snapbuild.c:401
struct SnapBuild * snapshot_builder
Definition: logical.h:46
bool filter_by_origin_cb_wrapper ( LogicalDecodingContext ctx,
RepOriginId  origin_id 
)

Definition at line 718 of file logical.c.

References LogicalDecodingContext::accept_writes, ErrorContextCallback::arg, ErrorContextCallback::callback, LogicalErrorCallbackState::callback_name, LogicalDecodingContext::callbacks, LogicalErrorCallbackState::ctx, error_context_stack, OutputPluginCallbacks::filter_by_origin_cb, InvalidXLogRecPtr, output_plugin_error_callback(), ErrorContextCallback::previous, and LogicalErrorCallbackState::report_location.

Referenced by FilterByOrigin().

719 {
721  ErrorContextCallback errcallback;
722  bool ret;
723 
724  /* Push callback + info on the error context stack */
725  state.ctx = ctx;
726  state.callback_name = "filter_by_origin";
729  errcallback.arg = (void *) &state;
730  errcallback.previous = error_context_stack;
731  error_context_stack = &errcallback;
732 
733  /* set output state */
734  ctx->accept_writes = false;
735 
736  /* do the actual work: call callback */
737  ret = ctx->callbacks.filter_by_origin_cb(ctx, origin_id);
738 
739  /* Pop the error context stack */
740  error_context_stack = errcallback.previous;
741 
742  return ret;
743 }
#define InvalidXLogRecPtr
Definition: xlogdefs.h:28
OutputPluginCallbacks callbacks
Definition: logical.h:48
struct ErrorContextCallback * previous
Definition: elog.h:238
const char * callback_name
Definition: logical.c:51
ErrorContextCallback * error_context_stack
Definition: elog.c:88
Definition: regguts.h:298
XLogRecPtr report_location
Definition: logical.c:52
void(* callback)(void *arg)
Definition: elog.h:239
LogicalDecodingContext * ctx
Definition: logical.c:50
static void output_plugin_error_callback(void *arg)
Definition: logical.c:551
LogicalDecodeFilterByOriginCB filter_by_origin_cb
void FreeDecodingContext ( LogicalDecodingContext ctx)

Definition at line 475 of file logical.c.

References LogicalDecodingContext::callbacks, LogicalDecodingContext::context, FreeSnapshotBuilder(), MemoryContextDelete(), LogicalDecodingContext::reader, LogicalDecodingContext::reorder, ReorderBufferFree(), OutputPluginCallbacks::shutdown_cb, shutdown_cb_wrapper(), LogicalDecodingContext::snapshot_builder, and XLogReaderFree().

Referenced by CreateReplicationSlot(), pg_create_logical_replication_slot(), pg_logical_slot_get_changes_guts(), and StartLogicalReplication().

476 {
477  if (ctx->callbacks.shutdown_cb != NULL)
478  shutdown_cb_wrapper(ctx);
479 
482  XLogReaderFree(ctx->reader);
484 }
void MemoryContextDelete(MemoryContext context)
Definition: mcxt.c:200
struct ReorderBuffer * reorder
Definition: logical.h:45
OutputPluginCallbacks callbacks
Definition: logical.h:48
void ReorderBufferFree(ReorderBuffer *rb)
MemoryContext context
Definition: logical.h:38
static void shutdown_cb_wrapper(LogicalDecodingContext *ctx)
Definition: logical.c:596
void XLogReaderFree(XLogReaderState *state)
Definition: xlogreader.c:127
void FreeSnapshotBuilder(SnapBuild *builder)
Definition: snapbuild.c:357
struct SnapBuild * snapshot_builder
Definition: logical.h:46
LogicalDecodeShutdownCB shutdown_cb
XLogReaderState * reader
Definition: logical.h:44
void LogicalConfirmReceivedLocation ( XLogRecPtr  lsn)

Definition at line 914 of file logical.c.

References Assert, ReplicationSlot::candidate_catalog_xmin, ReplicationSlot::candidate_restart_lsn, ReplicationSlot::candidate_restart_valid, ReplicationSlot::candidate_xmin_lsn, ReplicationSlotPersistentData::catalog_xmin, ReplicationSlotPersistentData::confirmed_flush, ReplicationSlot::data, DEBUG1, ReplicationSlot::effective_catalog_xmin, elog, InvalidTransactionId, InvalidXLogRecPtr, ReplicationSlot::mutex, MyReplicationSlot, ReplicationSlotMarkDirty(), ReplicationSlotSave(), ReplicationSlotsComputeRequiredLSN(), ReplicationSlotsComputeRequiredXmin(), ReplicationSlotPersistentData::restart_lsn, SpinLockAcquire, SpinLockRelease, and TransactionIdIsValid.

Referenced by LogicalIncreaseRestartDecodingForSlot(), LogicalIncreaseXminForSlot(), pg_logical_slot_get_changes_guts(), and ProcessStandbyReplyMessage().

915 {
916  Assert(lsn != InvalidXLogRecPtr);
917 
918  /* Do an unlocked check for candidate_lsn first. */
921  {
922  bool updated_xmin = false;
923  bool updated_restart = false;
924 
926 
928 
929  /* if we're past the location required for bumping xmin, do so */
932  {
933  /*
934  * We have to write the changed xmin to disk *before* we change
935  * the in-memory value, otherwise after a crash we wouldn't know
936  * that some catalog tuples might have been removed already.
937  *
938  * Ensure that by first writing to ->xmin and only update
939  * ->effective_xmin once the new state is synced to disk. After a
940  * crash ->effective_xmin is set to ->xmin.
941  */
944  {
948  updated_xmin = true;
949  }
950  }
951 
954  {
956 
960  updated_restart = true;
961  }
962 
964 
965  /* first write new xmin to disk, so we know what's up after a crash */
966  if (updated_xmin || updated_restart)
967  {
970  elog(DEBUG1, "updated xmin: %u restart: %u", updated_xmin, updated_restart);
971  }
972 
973  /*
974  * Now the new xmin is safely on disk, we can let the global value
975  * advance. We do not take ProcArrayLock or similar since we only
976  * advance xmin here and there's not much harm done by a concurrent
977  * computation missing that.
978  */
979  if (updated_xmin)
980  {
984 
987  }
988  }
989  else
990  {
994  }
995 }
TransactionId candidate_catalog_xmin
Definition: slot.h:135
#define InvalidXLogRecPtr
Definition: xlogdefs.h:28
#define DEBUG1
Definition: elog.h:25
void ReplicationSlotSave(void)
Definition: slot.c:638
ReplicationSlotPersistentData data
Definition: slot.h:120
XLogRecPtr confirmed_flush
Definition: slot.h:81
#define SpinLockAcquire(lock)
Definition: spin.h:62
void ReplicationSlotsComputeRequiredLSN(void)
Definition: slot.c:741
XLogRecPtr candidate_restart_valid
Definition: slot.h:137
TransactionId catalog_xmin
Definition: slot.h:70
#define InvalidTransactionId
Definition: transam.h:31
#define SpinLockRelease(lock)
Definition: spin.h:64
TransactionId effective_catalog_xmin
Definition: slot.h:117
ReplicationSlot * MyReplicationSlot
Definition: slot.c:96
#define Assert(condition)
Definition: c.h:664
XLogRecPtr restart_lsn
Definition: slot.h:73
XLogRecPtr candidate_xmin_lsn
Definition: slot.h:136
#define elog
Definition: elog.h:219
slock_t mutex
Definition: slot.h:93
#define TransactionIdIsValid(xid)
Definition: transam.h:41
void ReplicationSlotsComputeRequiredXmin(bool already_locked)
Definition: slot.c:695
XLogRecPtr candidate_restart_lsn
Definition: slot.h:138
void ReplicationSlotMarkDirty(void)
Definition: slot.c:656
void LogicalIncreaseRestartDecodingForSlot ( XLogRecPtr  current_lsn,
XLogRecPtr  restart_lsn 
)

Definition at line 845 of file logical.c.

References Assert, ReplicationSlot::candidate_restart_lsn, ReplicationSlot::candidate_restart_valid, ReplicationSlotPersistentData::confirmed_flush, ReplicationSlot::data, DEBUG1, elog, InvalidXLogRecPtr, LogicalConfirmReceivedLocation(), ReplicationSlot::mutex, MyReplicationSlot, SpinLockAcquire, and SpinLockRelease.

Referenced by SnapBuildProcessRunningXacts().

846 {
847  bool updated_lsn = false;
848  ReplicationSlot *slot;
849 
850  slot = MyReplicationSlot;
851 
852  Assert(slot != NULL);
853  Assert(restart_lsn != InvalidXLogRecPtr);
854  Assert(current_lsn != InvalidXLogRecPtr);
855 
856  SpinLockAcquire(&slot->mutex);
857 
858  /* don't overwrite if have a newer restart lsn */
859  if (restart_lsn <= slot->data.restart_lsn)
860  {
861  }
862 
863  /*
864  * We might have already flushed far enough to directly accept this lsn,
865  * in this case there is no need to check for existing candidate LSNs
866  */
867  else if (current_lsn <= slot->data.confirmed_flush)
868  {
869  slot->candidate_restart_valid = current_lsn;
870  slot->candidate_restart_lsn = restart_lsn;
871 
872  /* our candidate can directly be used */
873  updated_lsn = true;
874  }
875 
876  /*
877  * Only increase if the previous values have been applied, otherwise we
878  * might never end up updating if the receiver acks too slowly. A missed
879  * value here will just cause some extra effort after reconnecting.
880  */
882  {
883  slot->candidate_restart_valid = current_lsn;
884  slot->candidate_restart_lsn = restart_lsn;
885 
886  elog(DEBUG1, "got new restart lsn %X/%X at %X/%X",
887  (uint32) (restart_lsn >> 32), (uint32) restart_lsn,
888  (uint32) (current_lsn >> 32), (uint32) current_lsn);
889  }
890  else
891  {
892  elog(DEBUG1, "failed to increase restart lsn: proposed %X/%X, after %X/%X, current candidate %X/%X, current after %X/%X, flushed up to %X/%X",
893  (uint32) (restart_lsn >> 32), (uint32) restart_lsn,
894  (uint32) (current_lsn >> 32), (uint32) current_lsn,
895  (uint32) (slot->candidate_restart_lsn >> 32),
897  (uint32) (slot->candidate_restart_valid >> 32),
899  (uint32) (slot->data.confirmed_flush >> 32),
900  (uint32) slot->data.confirmed_flush
901  );
902  }
903  SpinLockRelease(&slot->mutex);
904 
905  /* candidates are already valid with the current flush position, apply */
906  if (updated_lsn)
908 }
#define InvalidXLogRecPtr
Definition: xlogdefs.h:28
#define DEBUG1
Definition: elog.h:25
ReplicationSlotPersistentData data
Definition: slot.h:120
XLogRecPtr confirmed_flush
Definition: slot.h:81
#define SpinLockAcquire(lock)
Definition: spin.h:62
XLogRecPtr candidate_restart_valid
Definition: slot.h:137
unsigned int uint32
Definition: c.h:258
#define SpinLockRelease(lock)
Definition: spin.h:64
ReplicationSlot * MyReplicationSlot
Definition: slot.c:96
#define Assert(condition)
Definition: c.h:664
void LogicalConfirmReceivedLocation(XLogRecPtr lsn)
Definition: logical.c:914
#define elog
Definition: elog.h:219
slock_t mutex
Definition: slot.h:93
XLogRecPtr candidate_restart_lsn
Definition: slot.h:138
void LogicalIncreaseXminForSlot ( XLogRecPtr  lsn,
TransactionId  xmin 
)

Definition at line 788 of file logical.c.

References Assert, ReplicationSlot::candidate_catalog_xmin, ReplicationSlot::candidate_xmin_lsn, ReplicationSlotPersistentData::catalog_xmin, ReplicationSlotPersistentData::confirmed_flush, ReplicationSlot::data, InvalidXLogRecPtr, LogicalConfirmReceivedLocation(), ReplicationSlot::mutex, MyReplicationSlot, SpinLockAcquire, SpinLockRelease, and TransactionIdPrecedesOrEquals().

Referenced by SnapBuildProcessRunningXacts().

789 {
790  bool updated_xmin = false;
791  ReplicationSlot *slot;
792 
793  slot = MyReplicationSlot;
794 
795  Assert(slot != NULL);
796 
797  SpinLockAcquire(&slot->mutex);
798 
799  /*
800  * don't overwrite if we already have a newer xmin. This can happen if we
801  * restart decoding in a slot.
802  */
804  {
805  }
806 
807  /*
808  * If the client has already confirmed up to this lsn, we directly can
809  * mark this as accepted. This can happen if we restart decoding in a
810  * slot.
811  */
812  else if (current_lsn <= slot->data.confirmed_flush)
813  {
814  slot->candidate_catalog_xmin = xmin;
815  slot->candidate_xmin_lsn = current_lsn;
816 
817  /* our candidate can directly be used */
818  updated_xmin = true;
819  }
820 
821  /*
822  * Only increase if the previous values have been applied, otherwise we
823  * might never end up updating if the receiver acks too slowly.
824  */
825  else if (slot->candidate_xmin_lsn == InvalidXLogRecPtr)
826  {
827  slot->candidate_catalog_xmin = xmin;
828  slot->candidate_xmin_lsn = current_lsn;
829  }
830  SpinLockRelease(&slot->mutex);
831 
832  /* candidate already valid with the current flush position, apply */
833  if (updated_xmin)
835 }
TransactionId candidate_catalog_xmin
Definition: slot.h:135
#define InvalidXLogRecPtr
Definition: xlogdefs.h:28
ReplicationSlotPersistentData data
Definition: slot.h:120
XLogRecPtr confirmed_flush
Definition: slot.h:81
#define SpinLockAcquire(lock)
Definition: spin.h:62
bool TransactionIdPrecedesOrEquals(TransactionId id1, TransactionId id2)
Definition: transam.c:319
TransactionId catalog_xmin
Definition: slot.h:70
#define SpinLockRelease(lock)
Definition: spin.h:64
ReplicationSlot * MyReplicationSlot
Definition: slot.c:96
#define Assert(condition)
Definition: c.h:664
void LogicalConfirmReceivedLocation(XLogRecPtr lsn)
Definition: logical.c:914
XLogRecPtr candidate_xmin_lsn
Definition: slot.h:136
slock_t mutex
Definition: slot.h:93