From 2d82d7e062241efccdd07de75d3f1eef37d775ce Mon Sep 17 00:00:00 2001 From: bdrouvotAWS Date: Tue, 7 Feb 2023 08:57:56 +0000 Subject: [PATCH v56 1/6] Handle logical slot conflicts on standby. During WAL replay on standby, when slot conflict is identified, invalidate such slots. Also do the same thing if wal_level on the primary server is reduced to below logical and there are existing logical slots on standby. Introduce a new ProcSignalReason value for slot conflict recovery. Author: Andres Freund (in an older version), Amit Khandekar, Bertrand Drouvot Reviewed-By: Bertrand Drouvot, Andres Freund, Robert Haas, Fabrizio de Royes Mello, Bharath Rupireddy --- src/backend/access/gist/gistxlog.c | 2 + src/backend/access/hash/hash_xlog.c | 1 + src/backend/access/heap/heapam.c | 3 + src/backend/access/nbtree/nbtxlog.c | 2 + src/backend/access/spgist/spgxlog.c | 1 + src/backend/access/transam/xlog.c | 21 +- .../replication/logical/logicalfuncs.c | 13 +- src/backend/replication/slot.c | 190 ++++++++++++++---- src/backend/replication/slotfuncs.c | 3 +- src/backend/replication/walsender.c | 7 + src/backend/storage/ipc/procsignal.c | 3 + src/backend/storage/ipc/standby.c | 13 +- src/backend/tcop/postgres.c | 28 +++ src/include/replication/slot.h | 57 +++++- src/include/storage/procsignal.h | 1 + src/include/storage/standby.h | 2 + 16 files changed, 296 insertions(+), 51 deletions(-) 7.1% src/backend/access/transam/ 5.3% src/backend/replication/logical/ 58.6% src/backend/replication/ 5.0% src/backend/storage/ipc/ 7.8% src/backend/tcop/ 12.6% src/include/replication/ 3.3% src/ diff --git a/src/backend/access/gist/gistxlog.c b/src/backend/access/gist/gistxlog.c index b7678f3c14..9a86fb3fef 100644 --- a/src/backend/access/gist/gistxlog.c +++ b/src/backend/access/gist/gistxlog.c @@ -197,6 +197,7 @@ gistRedoDeleteRecord(XLogReaderState *record) XLogRecGetBlockTag(record, 0, &rlocator, NULL, NULL); ResolveRecoveryConflictWithSnapshot(xldata->snapshotConflictHorizon, + xldata->isCatalogRel, rlocator); } @@ -390,6 +391,7 @@ gistRedoPageReuse(XLogReaderState *record) */ if (InHotStandby) ResolveRecoveryConflictWithSnapshotFullXid(xlrec->snapshotConflictHorizon, + xlrec->isCatalogRel, xlrec->locator); } diff --git a/src/backend/access/hash/hash_xlog.c b/src/backend/access/hash/hash_xlog.c index f2dd9be8d3..e8e06c62a9 100644 --- a/src/backend/access/hash/hash_xlog.c +++ b/src/backend/access/hash/hash_xlog.c @@ -1003,6 +1003,7 @@ hash_xlog_vacuum_one_page(XLogReaderState *record) XLogRecGetBlockTag(record, 0, &rlocator, NULL, NULL); ResolveRecoveryConflictWithSnapshot(xldata->snapshotConflictHorizon, + xldata->isCatalogRel, rlocator); } diff --git a/src/backend/access/heap/heapam.c b/src/backend/access/heap/heapam.c index f7d9ce59a4..371e855683 100644 --- a/src/backend/access/heap/heapam.c +++ b/src/backend/access/heap/heapam.c @@ -8717,6 +8717,7 @@ heap_xlog_prune(XLogReaderState *record) */ if (InHotStandby) ResolveRecoveryConflictWithSnapshot(xlrec->snapshotConflictHorizon, + xlrec->isCatalogRel, rlocator); /* @@ -8888,6 +8889,7 @@ heap_xlog_visible(XLogReaderState *record) */ if (InHotStandby) ResolveRecoveryConflictWithSnapshot(xlrec->snapshotConflictHorizon, + xlrec->flags & VISIBILITYMAP_XLOG_CATALOG_REL, rlocator); /* @@ -9009,6 +9011,7 @@ heap_xlog_freeze_page(XLogReaderState *record) XLogRecGetBlockTag(record, 0, &rlocator, NULL, NULL); ResolveRecoveryConflictWithSnapshot(xlrec->snapshotConflictHorizon, + xlrec->isCatalogRel, rlocator); } diff --git a/src/backend/access/nbtree/nbtxlog.c b/src/backend/access/nbtree/nbtxlog.c index 414ca4f6de..c87e46ed66 100644 --- a/src/backend/access/nbtree/nbtxlog.c +++ b/src/backend/access/nbtree/nbtxlog.c @@ -669,6 +669,7 @@ btree_xlog_delete(XLogReaderState *record) XLogRecGetBlockTag(record, 0, &rlocator, NULL, NULL); ResolveRecoveryConflictWithSnapshot(xlrec->snapshotConflictHorizon, + xlrec->isCatalogRel, rlocator); } @@ -1007,6 +1008,7 @@ btree_xlog_reuse_page(XLogReaderState *record) if (InHotStandby) ResolveRecoveryConflictWithSnapshotFullXid(xlrec->snapshotConflictHorizon, + xlrec->isCatalogRel, xlrec->locator); } diff --git a/src/backend/access/spgist/spgxlog.c b/src/backend/access/spgist/spgxlog.c index b071b59c8a..459ac929ba 100644 --- a/src/backend/access/spgist/spgxlog.c +++ b/src/backend/access/spgist/spgxlog.c @@ -879,6 +879,7 @@ spgRedoVacuumRedirect(XLogReaderState *record) XLogRecGetBlockTag(record, 0, &locator, NULL, NULL); ResolveRecoveryConflictWithSnapshot(xldata->snapshotConflictHorizon, + xldata->isCatalogRel, locator); } diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c index 46821ad605..10085aa0d6 100644 --- a/src/backend/access/transam/xlog.c +++ b/src/backend/access/transam/xlog.c @@ -6806,7 +6806,7 @@ CreateCheckPoint(int flags) */ XLByteToSeg(RedoRecPtr, _logSegNo, wal_segment_size); KeepLogSeg(recptr, &_logSegNo); - if (InvalidateObsoleteReplicationSlots(_logSegNo)) + if (InvalidateObsoleteReplicationSlots(_logSegNo, InvalidOid, NULL)) { /* * Some slots have been invalidated; recalculate the old-segment @@ -7250,7 +7250,7 @@ CreateRestartPoint(int flags) replayPtr = GetXLogReplayRecPtr(&replayTLI); endptr = (receivePtr < replayPtr) ? replayPtr : receivePtr; KeepLogSeg(endptr, &_logSegNo); - if (InvalidateObsoleteReplicationSlots(_logSegNo)) + if (InvalidateObsoleteReplicationSlots(_logSegNo, InvalidOid, NULL)) { /* * Some slots have been invalidated; recalculate the old-segment @@ -7963,6 +7963,23 @@ xlog_redo(XLogReaderState *record) /* Update our copy of the parameters in pg_control */ memcpy(&xlrec, XLogRecGetData(record), sizeof(xl_parameter_change)); + /* + * Invalidate logical slots if we are in hot standby and the primary + * does not have a WAL level sufficient for logical decoding. No need + * to search for potentially conflicting logically slots if standby is + * running with wal_level lower than logical, because in that case, we + * would have either disallowed creation of logical slots or + * invalidated existing ones. + */ + if (InRecovery && InHotStandby && + xlrec.wal_level < WAL_LEVEL_LOGICAL && + wal_level >= WAL_LEVEL_LOGICAL) + { + TransactionId ConflictHorizon = InvalidTransactionId; + + InvalidateObsoleteReplicationSlots(InvalidXLogRecPtr, InvalidOid, &ConflictHorizon); + } + LWLockAcquire(ControlFileLock, LW_EXCLUSIVE); ControlFile->MaxConnections = xlrec.MaxConnections; ControlFile->max_worker_processes = xlrec.max_worker_processes; diff --git a/src/backend/replication/logical/logicalfuncs.c b/src/backend/replication/logical/logicalfuncs.c index fa1b641a2b..070fd378e8 100644 --- a/src/backend/replication/logical/logicalfuncs.c +++ b/src/backend/replication/logical/logicalfuncs.c @@ -216,9 +216,9 @@ pg_logical_slot_get_changes_guts(FunctionCallInfo fcinfo, bool confirm, bool bin /* * After the sanity checks in CreateDecodingContext, make sure the - * restart_lsn is valid. Avoid "cannot get changes" wording in this - * errmsg because that'd be confusingly ambiguous about no changes - * being available. + * restart_lsn is valid or both xmin and catalog_xmin are valid. Avoid + * "cannot get changes" wording in this errmsg because that'd be + * confusingly ambiguous about no changes being available. */ if (XLogRecPtrIsInvalid(MyReplicationSlot->data.restart_lsn)) ereport(ERROR, @@ -227,6 +227,13 @@ pg_logical_slot_get_changes_guts(FunctionCallInfo fcinfo, bool confirm, bool bin NameStr(*name)), errdetail("This slot has never previously reserved WAL, or it has been invalidated."))); + if (LogicalReplicationSlotIsInvalid(MyReplicationSlot)) + ereport(ERROR, + (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE), + errmsg("cannot read from logical replication slot \"%s\"", + NameStr(*name)), + errdetail("This slot has been invalidated because it was conflicting with recovery."))); + MemoryContextSwitchTo(oldcontext); /* diff --git a/src/backend/replication/slot.c b/src/backend/replication/slot.c index 2293c0c6fc..265ed0f84c 100644 --- a/src/backend/replication/slot.c +++ b/src/backend/replication/slot.c @@ -110,6 +110,13 @@ static void RestoreSlotFromDisk(const char *name); static void CreateSlotOnDisk(ReplicationSlot *slot); static void SaveSlotToPath(ReplicationSlot *slot, const char *dir, int elevel); +/* to report termination/invalidation */ +static void ReportTerminationInvalidation(bool terminating, bool islogical, + int pid, NameData slotname, + TransactionId *xid, + XLogRecPtr restart_lsn, + XLogRecPtr oldestLSN); + /* * Report shared-memory space needed by ReplicationSlotsShmemInit. */ @@ -855,8 +862,7 @@ ReplicationSlotsComputeRequiredXmin(bool already_locked) SpinLockAcquire(&s->mutex); effective_xmin = s->effective_xmin; effective_catalog_xmin = s->effective_catalog_xmin; - invalidated = (!XLogRecPtrIsInvalid(s->data.invalidated_at) && - XLogRecPtrIsInvalid(s->data.restart_lsn)); + invalidated = SlotIsInvalid(s, true) || LogicalReplicationSlotIsInvalid(s); SpinLockRelease(&s->mutex); /* invalidated slots need not apply */ @@ -1225,28 +1231,91 @@ ReplicationSlotReserveWal(void) } } + +/* + * Report terminating or conflicting message. + * + * For both, logical conflict on standby and obsolete slot are handled. + */ +static void +ReportTerminationInvalidation(bool terminating, bool islogical, int pid, + NameData slotname, TransactionId *xid, + XLogRecPtr restart_lsn, XLogRecPtr oldestLSN) +{ + StringInfoData err_msg; + StringInfoData err_detail; + bool hint = false; + + initStringInfo(&err_msg); + initStringInfo(&err_detail); + + if (terminating) + appendStringInfo(&err_msg, _("terminating process %d to release replication slot \"%s\""), + pid, + NameStr(slotname)); + else + appendStringInfo(&err_msg, _("invalidating")); + + if (islogical) + { + if (terminating) + appendStringInfo(&err_msg, _(" because it conflicts with recovery")); + + if (TransactionIdIsValid(*xid)) + appendStringInfo(&err_detail, _("The slot conflicted with xid horizon %u."), *xid); + else + appendStringInfo(&err_detail, _("Logical decoding on standby requires wal_level to be at least logical on the primary server")); + } + else + { + if (!terminating) + appendStringInfo(&err_msg, _(" obsolete replication")); + + appendStringInfo(&err_detail, _("The slot's restart_lsn %X/%X exceeds the limit by %llu bytes."), + LSN_FORMAT_ARGS(restart_lsn), + (unsigned long long) (oldestLSN - restart_lsn)); + + hint = true; + } + + if (!terminating) + appendStringInfo(&err_msg, _(" slot \"%s\" because it conflicts with recovery"), + NameStr(slotname)); + + ereport(LOG, + errmsg("%s", err_msg.data), + errdetail("%s", err_detail.data), + hint ? errhint("You might need to increase max_slot_wal_keep_size.") : 0); + + pfree(err_msg.data); + pfree(err_detail.data); +} + /* - * Helper for InvalidateObsoleteReplicationSlots -- acquires the given slot - * and mark it invalid, if necessary and possible. + * Helper for InvalidateObsoleteReplicationSlots + * + * Acquires the given slot and mark it invalid, if necessary and possible. * * Returns whether ReplicationSlotControlLock was released in the interim (and * in that case we're not holding the lock at return, otherwise we are). * - * Sets *invalidated true if the slot was invalidated. (Untouched otherwise.) + * Sets *invalidated true if an obsolete slot was invalidated. (Untouched otherwise.) * * This is inherently racy, because we release the LWLock * for syscalls, so caller must restart if we return true. */ static bool InvalidatePossiblyObsoleteSlot(ReplicationSlot *s, XLogRecPtr oldestLSN, - bool *invalidated) + bool *invalidated, TransactionId *xid) { int last_signaled_pid = 0; bool released_lock = false; + bool islogical; for (;;) { XLogRecPtr restart_lsn; + NameData slotname; int active_pid = 0; @@ -1263,19 +1332,22 @@ InvalidatePossiblyObsoleteSlot(ReplicationSlot *s, XLogRecPtr oldestLSN, * Check if the slot needs to be invalidated. If it needs to be * invalidated, and is not currently acquired, acquire it and mark it * as having been invalidated. We do this with the spinlock held to - * avoid race conditions -- for example the restart_lsn could move - * forward, or the slot could be dropped. + * avoid race conditions -- for example the restart_lsn (or the + * xmin(s) could) move forward or the slot could be dropped. */ SpinLockAcquire(&s->mutex); restart_lsn = s->data.restart_lsn; /* - * If the slot is already invalid or is fresh enough, we don't need to - * do anything. + * If the slot is already invalid or is a non conflicting slot, we + * don't need to do anything. */ - if (XLogRecPtrIsInvalid(restart_lsn) || restart_lsn >= oldestLSN) + islogical = xid ? true : false; + + if (SlotIsInvalid(s, islogical) || SlotIsNotConflicting(s, islogical, xid, &oldestLSN)) { + /* then, we are not forcing for invalidation */ SpinLockRelease(&s->mutex); if (released_lock) LWLockRelease(ReplicationSlotControlLock); @@ -1294,9 +1366,16 @@ InvalidatePossiblyObsoleteSlot(ReplicationSlot *s, XLogRecPtr oldestLSN, { MyReplicationSlot = s; s->active_pid = MyProcPid; - s->data.invalidated_at = restart_lsn; - s->data.restart_lsn = InvalidXLogRecPtr; - + if (xid) + { + s->data.xmin = InvalidTransactionId; + s->data.catalog_xmin = InvalidTransactionId; + } + else + { + s->data.invalidated_at = restart_lsn; + s->data.restart_lsn = InvalidXLogRecPtr; + } /* Let caller know */ *invalidated = true; } @@ -1329,15 +1408,15 @@ InvalidatePossiblyObsoleteSlot(ReplicationSlot *s, XLogRecPtr oldestLSN, */ if (last_signaled_pid != active_pid) { - ereport(LOG, - errmsg("terminating process %d to release replication slot \"%s\"", - active_pid, NameStr(slotname)), - errdetail("The slot's restart_lsn %X/%X exceeds the limit by %llu bytes.", - LSN_FORMAT_ARGS(restart_lsn), - (unsigned long long) (oldestLSN - restart_lsn)), - errhint("You might need to increase max_slot_wal_keep_size.")); - - (void) kill(active_pid, SIGTERM); + ReportTerminationInvalidation(true, islogical, active_pid, + slotname, xid, restart_lsn, + oldestLSN); + + if (islogical) + (void) SendProcSignal(active_pid, PROCSIG_RECOVERY_CONFLICT_LOGICALSLOT, InvalidBackendId); + else + (void) kill(active_pid, SIGTERM); + last_signaled_pid = active_pid; } @@ -1370,14 +1449,11 @@ InvalidatePossiblyObsoleteSlot(ReplicationSlot *s, XLogRecPtr oldestLSN, ReplicationSlotMarkDirty(); ReplicationSlotSave(); ReplicationSlotRelease(); + pgstat_drop_replslot(s); - ereport(LOG, - errmsg("invalidating obsolete replication slot \"%s\"", - NameStr(slotname)), - errdetail("The slot's restart_lsn %X/%X exceeds the limit by %llu bytes.", - LSN_FORMAT_ARGS(restart_lsn), - (unsigned long long) (oldestLSN - restart_lsn)), - errhint("You might need to increase max_slot_wal_keep_size.")); + ReportTerminationInvalidation(false, islogical, active_pid, + slotname, xid, restart_lsn, + oldestLSN); /* done with this slot for now */ break; @@ -1390,20 +1466,36 @@ InvalidatePossiblyObsoleteSlot(ReplicationSlot *s, XLogRecPtr oldestLSN, } /* - * Mark any slot that points to an LSN older than the given segment - * as invalid; it requires WAL that's about to be removed. + * Invalidate Obsolete slots or resolve recovery conflicts with logical slots. + * + * Obsolete case (aka xid is NULL): * - * Returns true when any slot have got invalidated. + * Mark any slot that points to an LSN older than the given segment + * as invalid; it requires WAL that's about to be removed. + * invalidated is set to true when any slot have got invalidated. * - * NB - this runs as part of checkpoint, so avoid raising errors if possible. + * Logical replication slot case: + * + * When xid is valid, it means that we are about to remove rows older than xid. + * Therefore we need to invalidate slots that depend on seeing those rows. + * When xid is invalid, invalidate all logical slots. This is required when the + * master wal_level is set back to replica, so existing logical slots need to + * be invalidated. */ bool -InvalidateObsoleteReplicationSlots(XLogSegNo oldestSegno) +InvalidateObsoleteReplicationSlots(XLogSegNo oldestSegno, Oid dboid, TransactionId *xid) { - XLogRecPtr oldestLSN; + + XLogRecPtr oldestLSN = InvalidXLogRecPtr; bool invalidated = false; - XLogSegNoOffsetToRecPtr(oldestSegno, 0, wal_segment_size, oldestLSN); + Assert(max_replication_slots >= 0); + + if (max_replication_slots == 0) + return invalidated; + + if (!xid) + XLogSegNoOffsetToRecPtr(oldestSegno, 0, wal_segment_size, oldestLSN); restart: LWLockAcquire(ReplicationSlotControlLock, LW_SHARED); @@ -1414,21 +1506,35 @@ restart: if (!s->in_use) continue; - if (InvalidatePossiblyObsoleteSlot(s, oldestLSN, &invalidated)) + if (xid) { - /* if the lock was released, start from scratch */ - goto restart; + /* we are only dealing with *logical* slot conflicts */ + if (!SlotIsLogical(s)) + continue; + + /* + * not the database of interest and we don't want all the + * database, skip + */ + if (s->data.database != dboid && TransactionIdIsValid(*xid)) + continue; } + + if (InvalidatePossiblyObsoleteSlot(s, oldestLSN, &invalidated, xid)) + goto restart; } + LWLockRelease(ReplicationSlotControlLock); /* - * If any slots have been invalidated, recalculate the resource limits. + * If any slots have been invalidated, recalculate the required xmin and + * the required lsn (if appropriate). */ if (invalidated) { ReplicationSlotsComputeRequiredXmin(false); - ReplicationSlotsComputeRequiredLSN(); + if (!xid) + ReplicationSlotsComputeRequiredLSN(); } return invalidated; diff --git a/src/backend/replication/slotfuncs.c b/src/backend/replication/slotfuncs.c index 2f3c964824..015d276fd9 100644 --- a/src/backend/replication/slotfuncs.c +++ b/src/backend/replication/slotfuncs.c @@ -319,8 +319,7 @@ pg_get_replication_slots(PG_FUNCTION_ARGS) * certain that the slot has been invalidated. Otherwise, test * availability from restart_lsn. */ - if (XLogRecPtrIsInvalid(slot_contents.data.restart_lsn) && - !XLogRecPtrIsInvalid(slot_contents.data.invalidated_at)) + if (ObsoleteSlotIsInvalid(slot, true)) walstate = WALAVAIL_REMOVED; else walstate = GetWALAvailability(slot_contents.data.restart_lsn); diff --git a/src/backend/replication/walsender.c b/src/backend/replication/walsender.c index 75e8363e24..b686691ca2 100644 --- a/src/backend/replication/walsender.c +++ b/src/backend/replication/walsender.c @@ -1253,6 +1253,13 @@ StartLogicalReplication(StartReplicationCmd *cmd) ReplicationSlotAcquire(cmd->slotname, true); + if (LogicalReplicationSlotIsInvalid(MyReplicationSlot)) + ereport(ERROR, + (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE), + errmsg("cannot read from logical replication slot \"%s\"", + cmd->slotname), + errdetail("This slot has been invalidated because it was conflicting with recovery."))); + if (XLogRecPtrIsInvalid(MyReplicationSlot->data.restart_lsn)) ereport(ERROR, (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE), diff --git a/src/backend/storage/ipc/procsignal.c b/src/backend/storage/ipc/procsignal.c index 395b2cf690..c85cb5cc18 100644 --- a/src/backend/storage/ipc/procsignal.c +++ b/src/backend/storage/ipc/procsignal.c @@ -673,6 +673,9 @@ procsignal_sigusr1_handler(SIGNAL_ARGS) if (CheckProcSignal(PROCSIG_RECOVERY_CONFLICT_SNAPSHOT)) RecoveryConflictInterrupt(PROCSIG_RECOVERY_CONFLICT_SNAPSHOT); + if (CheckProcSignal(PROCSIG_RECOVERY_CONFLICT_LOGICALSLOT)) + RecoveryConflictInterrupt(PROCSIG_RECOVERY_CONFLICT_LOGICALSLOT); + if (CheckProcSignal(PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK)) RecoveryConflictInterrupt(PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK); diff --git a/src/backend/storage/ipc/standby.c b/src/backend/storage/ipc/standby.c index 9f56b4e95c..c62245afc7 100644 --- a/src/backend/storage/ipc/standby.c +++ b/src/backend/storage/ipc/standby.c @@ -24,6 +24,7 @@ #include "access/xlogutils.h" #include "miscadmin.h" #include "pgstat.h" +#include "replication/slot.h" #include "storage/bufmgr.h" #include "storage/lmgr.h" #include "storage/proc.h" @@ -466,6 +467,7 @@ ResolveRecoveryConflictWithVirtualXIDs(VirtualTransactionId *waitlist, */ void ResolveRecoveryConflictWithSnapshot(TransactionId snapshotConflictHorizon, + bool isCatalogRel, RelFileLocator locator) { VirtualTransactionId *backends; @@ -491,6 +493,9 @@ ResolveRecoveryConflictWithSnapshot(TransactionId snapshotConflictHorizon, PROCSIG_RECOVERY_CONFLICT_SNAPSHOT, WAIT_EVENT_RECOVERY_CONFLICT_SNAPSHOT, true); + + if (wal_level >= WAL_LEVEL_LOGICAL && isCatalogRel) + InvalidateObsoleteReplicationSlots(InvalidXLogRecPtr, locator.dbOid, &snapshotConflictHorizon); } /* @@ -499,6 +504,7 @@ ResolveRecoveryConflictWithSnapshot(TransactionId snapshotConflictHorizon, */ void ResolveRecoveryConflictWithSnapshotFullXid(FullTransactionId snapshotConflictHorizon, + bool isCatalogRel, RelFileLocator locator) { /* @@ -517,7 +523,9 @@ ResolveRecoveryConflictWithSnapshotFullXid(FullTransactionId snapshotConflictHor TransactionId truncated; truncated = XidFromFullTransactionId(snapshotConflictHorizon); - ResolveRecoveryConflictWithSnapshot(truncated, locator); + ResolveRecoveryConflictWithSnapshot(truncated, + isCatalogRel, + locator); } } @@ -1478,6 +1486,9 @@ get_recovery_conflict_desc(ProcSignalReason reason) case PROCSIG_RECOVERY_CONFLICT_SNAPSHOT: reasonDesc = _("recovery conflict on snapshot"); break; + case PROCSIG_RECOVERY_CONFLICT_LOGICALSLOT: + reasonDesc = _("recovery conflict on replication slot"); + break; case PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK: reasonDesc = _("recovery conflict on buffer deadlock"); break; diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c index cab709b07b..e1c45eb2ad 100644 --- a/src/backend/tcop/postgres.c +++ b/src/backend/tcop/postgres.c @@ -2488,6 +2488,9 @@ errdetail_recovery_conflict(void) case PROCSIG_RECOVERY_CONFLICT_SNAPSHOT: errdetail("User query might have needed to see row versions that must be removed."); break; + case PROCSIG_RECOVERY_CONFLICT_LOGICALSLOT: + errdetail("User was using the logical slot that must be dropped."); + break; case PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK: errdetail("User transaction caused buffer deadlock with recovery."); break; @@ -3099,6 +3102,31 @@ RecoveryConflictInterrupt(ProcSignalReason reason) /* Intentional fall through to session cancel */ /* FALLTHROUGH */ + case PROCSIG_RECOVERY_CONFLICT_LOGICALSLOT: + + /* + * For conflicts that require a logical slot to be + * invalidated, the requirement is for the signal receiver to + * release the slot, so that it could be invalidated by the + * signal sender. So for normal backends, the transaction + * should be aborted, just like for other recovery conflicts. + * But if it's walsender on standby, we don't want to go + * through the following IsTransactionOrTransactionBlock() + * check, so break here. + */ + if (am_cascading_walsender && + reason == PROCSIG_RECOVERY_CONFLICT_LOGICALSLOT && + MyReplicationSlot && SlotIsLogical(MyReplicationSlot)) + { + RecoveryConflictPending = true; + QueryCancelPending = true; + InterruptPending = true; + break; + } + + /* Intentional fall through to session cancel */ + /* FALLTHROUGH */ + case PROCSIG_RECOVERY_CONFLICT_DATABASE: RecoveryConflictPending = true; ProcDiePending = true; diff --git a/src/include/replication/slot.h b/src/include/replication/slot.h index 8872c80cdf..782bf658c3 100644 --- a/src/include/replication/slot.h +++ b/src/include/replication/slot.h @@ -168,6 +168,60 @@ typedef struct ReplicationSlot #define SlotIsPhysical(slot) ((slot)->data.database == InvalidOid) #define SlotIsLogical(slot) ((slot)->data.database != InvalidOid) +static inline bool +ObsoleteSlotIsInvalid(ReplicationSlot *s, bool check_invalidated_at) +{ + if (check_invalidated_at) + return (!XLogRecPtrIsInvalid(s->data.invalidated_at) && + XLogRecPtrIsInvalid(s->data.restart_lsn)); + else + return (XLogRecPtrIsInvalid(s->data.restart_lsn)); +} + +static inline bool +LogicalReplicationSlotIsInvalid(ReplicationSlot *s) +{ + return (!TransactionIdIsValid(s->data.xmin) && + !TransactionIdIsValid(s->data.catalog_xmin)); +} + +static inline bool +SlotIsInvalid(ReplicationSlot *s, bool islogical) +{ + if (islogical) + return LogicalReplicationSlotIsInvalid(s); + else + return ObsoleteSlotIsInvalid(s, false); +} + +static inline bool +LogicalReplicationSlotXidsConflict(ReplicationSlot *s, TransactionId xid) +{ + TransactionId slot_xmin; + TransactionId slot_catalog_xmin; + + slot_xmin = s->data.xmin; + slot_catalog_xmin = s->data.catalog_xmin; + + return (((TransactionIdIsValid(slot_xmin) && TransactionIdPrecedesOrEquals(slot_xmin, xid)) || + (TransactionIdIsValid(slot_catalog_xmin) && TransactionIdPrecedesOrEquals(slot_catalog_xmin, xid)))); +} + +static inline bool +SlotIsFreshEnough(ReplicationSlot *s, XLogRecPtr oldestLSN) +{ + return (s->data.restart_lsn >= oldestLSN); +} + +static inline bool +SlotIsNotConflicting(ReplicationSlot *s, bool islogical, TransactionId *xid, XLogRecPtr *oldestLSN) +{ + if (islogical) + return (TransactionIdIsValid(*xid) && !LogicalReplicationSlotXidsConflict(s, *xid)); + else + return SlotIsFreshEnough(s, *oldestLSN); +} + /* * Shared memory control area for all of replication slots. */ @@ -215,7 +269,7 @@ extern void ReplicationSlotsComputeRequiredLSN(void); extern XLogRecPtr ReplicationSlotsComputeLogicalRestartLSN(void); extern bool ReplicationSlotsCountDBSlots(Oid dboid, int *nslots, int *nactive); extern void ReplicationSlotsDropDBSlots(Oid dboid); -extern bool InvalidateObsoleteReplicationSlots(XLogSegNo oldestSegno); +extern bool InvalidateObsoleteReplicationSlots(XLogSegNo oldestSegno, Oid dboid, TransactionId *xid); extern ReplicationSlot *SearchNamedReplicationSlot(const char *name, bool need_lock); extern int ReplicationSlotIndex(ReplicationSlot *slot); extern bool ReplicationSlotName(int index, Name name); @@ -227,5 +281,6 @@ extern void CheckPointReplicationSlots(void); extern void CheckSlotRequirements(void); extern void CheckSlotPermissions(void); +extern void ResolveRecoveryConflictWithLogicalSlots(Oid dboid, TransactionId xid, char *reason); #endif /* SLOT_H */ diff --git a/src/include/storage/procsignal.h b/src/include/storage/procsignal.h index 905af2231b..2f52100b00 100644 --- a/src/include/storage/procsignal.h +++ b/src/include/storage/procsignal.h @@ -42,6 +42,7 @@ typedef enum PROCSIG_RECOVERY_CONFLICT_TABLESPACE, PROCSIG_RECOVERY_CONFLICT_LOCK, PROCSIG_RECOVERY_CONFLICT_SNAPSHOT, + PROCSIG_RECOVERY_CONFLICT_LOGICALSLOT, PROCSIG_RECOVERY_CONFLICT_BUFFERPIN, PROCSIG_RECOVERY_CONFLICT_STARTUP_DEADLOCK, diff --git a/src/include/storage/standby.h b/src/include/storage/standby.h index 2effdea126..41f4dc372e 100644 --- a/src/include/storage/standby.h +++ b/src/include/storage/standby.h @@ -30,8 +30,10 @@ extern void InitRecoveryTransactionEnvironment(void); extern void ShutdownRecoveryTransactionEnvironment(void); extern void ResolveRecoveryConflictWithSnapshot(TransactionId snapshotConflictHorizon, + bool isCatalogRel, RelFileLocator locator); extern void ResolveRecoveryConflictWithSnapshotFullXid(FullTransactionId snapshotConflictHorizon, + bool isCatalogRel, RelFileLocator locator); extern void ResolveRecoveryConflictWithTablespace(Oid tsid); extern void ResolveRecoveryConflictWithDatabase(Oid dbid); -- 2.34.1