From 2fba7797aa9f3392a590ae85ca5db0809036dd5e Mon Sep 17 00:00:00 2001 From: Bharath Rupireddy Date: Tue, 24 Mar 2026 20:42:24 +0000 Subject: [PATCH v3] Add XID age based replication slot invalidation Introduce max_slot_xid_age, a GUC that invalidates replication slots whose xmin or catalog_xmin exceeds the specified age. Disabled by default. Idle or forgotten replication slots can hold back vacuum, leading to bloat and eventually XID wraparound. In the worst case this requires dropping the slot and single-user mode vacuuming. This setting avoids that by proactively invalidating slots that have fallen too far behind. Invalidation checks are performed once per relation during vacuum (both vacuum command and autovacuum). --- doc/src/sgml/config.sgml | 29 +++ doc/src/sgml/system-views.sgml | 8 + src/backend/access/transam/xlog.c | 5 +- src/backend/commands/vacuum.c | 16 ++ src/backend/replication/slot.c | 157 ++++++++++++++++- src/backend/storage/ipc/standby.c | 3 +- src/backend/utils/misc/guc_parameters.dat | 8 + src/backend/utils/misc/postgresql.conf.sample | 2 + src/include/replication/slot.h | 10 +- src/test/recovery/t/019_replslot_limit.pl | 166 ++++++++++++++++++ 10 files changed, 394 insertions(+), 10 deletions(-) diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index 8cdd826fbd3..e04b1384703 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -4764,6 +4764,35 @@ restore_command = 'copy "C:\\server\\archivedir\\%f" "%p"' # Windows + + max_slot_xid_age (integer) + + max_slot_xid_age configuration parameter + + + + + Invalidate replication slots whose xmin (the oldest + transaction that this slot needs the database to retain) or + catalog_xmin (the oldest transaction affecting the + system catalogs that this slot needs the database to retain) has reached + the age specified by this setting. This invalidation check happens + during vacuum (both VACUUM command and autovacuum). + A value of zero (which is default) disables this feature. Users can set + this value anywhere from zero to two billion. This parameter can only be + set in the postgresql.conf file or on the server + command line. + + + + Idle or forgotten replication slots can hold back vacuum, leading to + bloat and eventually transaction ID wraparound. This setting avoids + that by invalidating slots that have fallen too far behind. + See for more details. + + + + wal_sender_timeout (integer) diff --git a/doc/src/sgml/system-views.sgml b/doc/src/sgml/system-views.sgml index 9ee1a2bfc6a..1a507b430f9 100644 --- a/doc/src/sgml/system-views.sgml +++ b/doc/src/sgml/system-views.sgml @@ -3102,6 +3102,14 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx duration. + + + xid_aged means that the slot's + xmin or catalog_xmin + has reached the age specified by + parameter. + + diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c index f5c9a34374d..d5d43620aad 100644 --- a/src/backend/access/transam/xlog.c +++ b/src/backend/access/transam/xlog.c @@ -7443,7 +7443,7 @@ CreateCheckPoint(int flags) KeepLogSeg(recptr, &_logSegNo); if (InvalidateObsoleteReplicationSlots(RS_INVAL_WAL_REMOVED | RS_INVAL_IDLE_TIMEOUT, _logSegNo, InvalidOid, - InvalidTransactionId)) + InvalidTransactionId, InvalidTransactionId)) { /* * Some slots have been invalidated; recalculate the old-segment @@ -7900,7 +7900,7 @@ CreateRestartPoint(int flags) if (InvalidateObsoleteReplicationSlots(RS_INVAL_WAL_REMOVED | RS_INVAL_IDLE_TIMEOUT, _logSegNo, InvalidOid, - InvalidTransactionId)) + InvalidTransactionId, InvalidTransactionId)) { /* * Some slots have been invalidated; recalculate the old-segment @@ -8764,6 +8764,7 @@ xlog_redo(XLogReaderState *record) */ InvalidateObsoleteReplicationSlots(RS_INVAL_WAL_LEVEL, 0, InvalidOid, + InvalidTransactionId, InvalidTransactionId); } else if (sync_replication_slots) diff --git a/src/backend/commands/vacuum.c b/src/backend/commands/vacuum.c index bce3a2daa24..252224c0bd6 100644 --- a/src/backend/commands/vacuum.c +++ b/src/backend/commands/vacuum.c @@ -48,6 +48,7 @@ #include "postmaster/autovacuum.h" #include "postmaster/bgworker_internals.h" #include "postmaster/interrupt.h" +#include "replication/slot.h" #include "storage/bufmgr.h" #include "storage/lmgr.h" #include "storage/pmsignal.h" @@ -1145,6 +1146,21 @@ vacuum_get_cutoffs(Relation rel, const VacuumParams params, nextXID = ReadNextTransactionId(); nextMXID = ReadNextMultiXactId(); + /* + * Try to invalidate XID-aged replication slots that may interfere with + * vacuum's ability to freeze and remove dead tuples. Since OldestXmin + * already covers the slot xmin/catalog_xmin values, pass it as a + * preliminary check to avoid additional iteration over all the slots. + * + * If at least one slot was invalidated, recompute OldestXmin so that this + * vacuum benefits from the advanced horizon immediately. + */ + if (InvalidateXIDAgedReplicationSlots(cutoffs->OldestXmin, nextXID)) + { + cutoffs->OldestXmin = GetOldestNonRemovableTransactionId(rel); + Assert(TransactionIdIsNormal(cutoffs->OldestXmin)); + } + /* * Also compute the multixact age for which freezing is urgent. This is * normally autovacuum_multixact_freeze_max_age, but may be less if diff --git a/src/backend/replication/slot.c b/src/backend/replication/slot.c index a9092fc2382..b6905e7bb43 100644 --- a/src/backend/replication/slot.c +++ b/src/backend/replication/slot.c @@ -117,6 +117,7 @@ static const SlotInvalidationCauseMap SlotInvalidationCauses[] = { {RS_INVAL_HORIZON, "rows_removed"}, {RS_INVAL_WAL_LEVEL, "wal_level_insufficient"}, {RS_INVAL_IDLE_TIMEOUT, "idle_timeout"}, + {RS_INVAL_XID_AGE, "xid_aged"}, }; /* @@ -158,6 +159,12 @@ int max_replication_slots = 10; /* the maximum number of replication */ int idle_replication_slot_timeout_secs = 0; +/* + * Invalidate replication slots that have xmin or catalog_xmin greater + * than the specified age; '0' disables it. + */ +int max_slot_xid_age = 0; + /* * This GUC lists streaming replication standby server slot names that * logical WAL sender processes will wait for. @@ -176,6 +183,8 @@ static XLogRecPtr ss_oldest_flush_lsn = InvalidXLogRecPtr; static void ReplicationSlotShmemExit(int code, Datum arg); static bool IsSlotForConflictCheck(const char *name); static void ReplicationSlotDropPtr(ReplicationSlot *slot); +static bool IsReplicationSlotXIDAged(TransactionId xmin, TransactionId catalog_xmin, + TransactionId nextXID); /* internal persistency functions */ static void RestoreSlotFromDisk(const char *name); @@ -1780,7 +1789,10 @@ ReportSlotInvalidation(ReplicationSlotInvalidationCause cause, XLogRecPtr restart_lsn, XLogRecPtr oldestLSN, TransactionId snapshotConflictHorizon, - long slot_idle_seconds) + long slot_idle_seconds, + TransactionId xmin, + TransactionId catalog_xmin, + TransactionId nextXID) { StringInfoData err_detail; StringInfoData err_hint; @@ -1825,6 +1837,36 @@ ReportSlotInvalidation(ReplicationSlotInvalidationCause cause, "idle_replication_slot_timeout"); break; } + + case RS_INVAL_XID_AGE: + { + Assert(TransactionIdIsValid(xmin) || TransactionIdIsValid(catalog_xmin)); + + if (TransactionIdIsValid(xmin)) + { + /* translator: %s is a GUC variable name */ + appendStringInfo(&err_detail, _("The slot's xmin %u at next transaction ID %u exceeds the age %d specified by \"%s\"."), + xmin, + nextXID, + max_slot_xid_age, + "max_slot_xid_age"); + } + else + { + /* translator: %s is a GUC variable name */ + appendStringInfo(&err_detail, _("The slot's catalog xmin %u at next transaction ID %u exceeds the age %d specified by \"%s\"."), + catalog_xmin, + nextXID, + max_slot_xid_age, + "max_slot_xid_age"); + } + + /* translator: %s is a GUC variable name */ + appendStringInfo(&err_hint, _("You might need to increase \"%s\"."), + "max_slot_xid_age"); + break; + } + case RS_INVAL_NONE: pg_unreachable(); } @@ -1874,6 +1916,7 @@ static ReplicationSlotInvalidationCause DetermineSlotInvalidationCause(uint32 possible_causes, ReplicationSlot *s, XLogRecPtr oldestLSN, Oid dboid, TransactionId snapshotConflictHorizon, + TransactionId nextXID, TimestampTz *inactive_since, TimestampTz now) { Assert(possible_causes != RS_INVAL_NONE); @@ -1945,6 +1988,11 @@ DetermineSlotInvalidationCause(uint32 possible_causes, ReplicationSlot *s, } } + /* Check if the slot needs to be invalidated due to max_slot_xid_age GUC */ + if ((possible_causes & RS_INVAL_XID_AGE) && + IsReplicationSlotXIDAged(s->data.xmin, s->data.catalog_xmin, nextXID)) + return RS_INVAL_XID_AGE; + return RS_INVAL_NONE; } @@ -1967,6 +2015,7 @@ InvalidatePossiblyObsoleteSlot(uint32 possible_causes, ReplicationSlot *s, XLogRecPtr oldestLSN, Oid dboid, TransactionId snapshotConflictHorizon, + TransactionId nextXID, bool *released_lock_out) { int last_signaled_pid = 0; @@ -2019,6 +2068,7 @@ InvalidatePossiblyObsoleteSlot(uint32 possible_causes, s, oldestLSN, dboid, snapshotConflictHorizon, + nextXID, &inactive_since, now); @@ -2112,7 +2162,8 @@ InvalidatePossiblyObsoleteSlot(uint32 possible_causes, ReportSlotInvalidation(invalidation_cause, true, active_pid, slotname, restart_lsn, oldestLSN, snapshotConflictHorizon, - slot_idle_secs); + slot_idle_secs, s->data.xmin, + s->data.catalog_xmin, nextXID); if (MyBackendType == B_STARTUP) (void) SignalRecoveryConflict(GetPGProcByNumber(active_proc), @@ -2165,7 +2216,8 @@ InvalidatePossiblyObsoleteSlot(uint32 possible_causes, ReportSlotInvalidation(invalidation_cause, false, active_pid, slotname, restart_lsn, oldestLSN, snapshotConflictHorizon, - slot_idle_secs); + slot_idle_secs, s->data.xmin, + s->data.catalog_xmin, nextXID); /* done with this slot for now */ break; @@ -2192,6 +2244,8 @@ InvalidatePossiblyObsoleteSlot(uint32 possible_causes, * logical. * - RS_INVAL_IDLE_TIMEOUT: has been idle longer than the configured * "idle_replication_slot_timeout" duration. + * - RS_INVAL_XID_AGE: slot xid age is older than the configured + * "max_slot_xid_age" age. * * Note: This function attempts to invalidate the slot for multiple possible * causes in a single pass, minimizing redundant iterations. The "cause" @@ -2205,7 +2259,7 @@ InvalidatePossiblyObsoleteSlot(uint32 possible_causes, bool InvalidateObsoleteReplicationSlots(uint32 possible_causes, XLogSegNo oldestSegno, Oid dboid, - TransactionId snapshotConflictHorizon) + TransactionId snapshotConflictHorizon, TransactionId nextXID) { XLogRecPtr oldestLSN; bool invalidated = false; @@ -2244,7 +2298,7 @@ restart: if (InvalidatePossiblyObsoleteSlot(possible_causes, s, oldestLSN, dboid, snapshotConflictHorizon, - &released_lock)) + nextXID, &released_lock)) { Assert(released_lock); @@ -3275,3 +3329,96 @@ WaitForStandbyConfirmation(XLogRecPtr wait_for_lsn) ConditionVariableCancelSleep(); } + +/* + * Return true if xmin or catalog_xmin exceeds the max_slot_xid_age GUC. + */ +static bool +IsReplicationSlotXIDAged(TransactionId xmin, TransactionId catalog_xmin, + TransactionId nextXID) +{ + TransactionId cutoffXID; + bool aged = false; + + if (max_slot_xid_age == 0) + return false; + + if (!TransactionIdIsNormal(nextXID)) + return false; + + /* + * Calculate oldest XID a slot's xmin or catalog_xmin can have before they + * are invalidated. + */ + cutoffXID = nextXID - max_slot_xid_age; + + /* ensure it's a "normal" XID, else TransactionIdPrecedes misbehaves */ + /* this can cause the limit to go backwards by 3, but that's OK */ + if (cutoffXID < FirstNormalTransactionId) + cutoffXID -= FirstNormalTransactionId; + + if (TransactionIdIsNormal(xmin) && + TransactionIdPrecedes(xmin, cutoffXID)) + aged = true; + + if (TransactionIdIsNormal(catalog_xmin) && + TransactionIdPrecedes(catalog_xmin, cutoffXID)) + aged = true; + + return aged; +} + +/* + * Invalidate replication slots whose XID age exceeds the max_slot_xid_age + * GUC. + * + * The caller supplies oldestXmin, either computed via + * GetOldestNonRemovableTransactionId during vacuum, or computed via the + * minimum of slot xmin values obtained from ProcArrayGetReplicationSlotXmin, + * and nextXID, the next XID to be assigned used to compute the age. + * + * A preliminary check based on the passed-in oldestXmin is done to avoid + * unnecessarily iterating over all the slots. For this check to be + * effective, oldestXmin must account for slot xmin/catalog_xmin values; if + * its age does not exceed the GUC then no individual slot can either, so the + * per-slot scan is skipped. For example, if oldestXmin is 100 and the GUC + * is 500, every slot's xmin must be >= 100, so none can be older than the + * GUC. + * + * Even if the caller passes an oldestXmin that does not include the slot + * xmin/catalog_xmin range, there is no risk of incorrect invalidation: each + * slot's own xmin and catalog_xmin are individually verified against the GUC + * inside IsReplicationSlotXIDAged(). The only downside is an additional + * iteration over all the slots. + * + * Returns true if at least one slot was invalidated. + */ +bool +InvalidateXIDAgedReplicationSlots(TransactionId oldestXmin, TransactionId nextXID) +{ + TransactionId cutoffXID; + bool invalidated = false; + + Assert(TransactionIdIsNormal(oldestXmin)); + + if (max_slot_xid_age == 0) + return false; + + cutoffXID = nextXID - max_slot_xid_age; + + /* ensure it's a "normal" XID, else TransactionIdPrecedes misbehaves */ + /* this can cause the limit to go backwards by 3, but that's OK */ + if (!TransactionIdIsNormal(cutoffXID)) + cutoffXID = FirstNormalTransactionId; + + if (TransactionIdPrecedes(oldestXmin, cutoffXID)) + { + invalidated = InvalidateObsoleteReplicationSlots(RS_INVAL_XID_AGE, + 0, + InvalidOid, + InvalidTransactionId, + nextXID); + } + + return invalidated; +} diff --git a/src/backend/storage/ipc/standby.c b/src/backend/storage/ipc/standby.c index f3ad90c7c7a..26816d8b73c 100644 --- a/src/backend/storage/ipc/standby.c +++ b/src/backend/storage/ipc/standby.c @@ -503,7 +503,8 @@ ResolveRecoveryConflictWithSnapshot(TransactionId snapshotConflictHorizon, */ if (IsLogicalDecodingEnabled() && isCatalogRel) InvalidateObsoleteReplicationSlots(RS_INVAL_HORIZON, 0, locator.dbOid, - snapshotConflictHorizon); + snapshotConflictHorizon, + InvalidTransactionId); } /* diff --git a/src/backend/utils/misc/guc_parameters.dat b/src/backend/utils/misc/guc_parameters.dat index 0c9854ad8fc..7fab02f1eeb 100644 --- a/src/backend/utils/misc/guc_parameters.dat +++ b/src/backend/utils/misc/guc_parameters.dat @@ -2049,6 +2049,14 @@ max => 'MAX_KILOBYTES', }, +{ name => 'max_slot_xid_age', type => 'int', context => 'PGC_SIGHUP', group => 'REPLICATION_SENDING', + short_desc => 'Age of the transaction ID at which a replication slot gets invalidated.', + variable => 'max_slot_xid_age', + boot_val => '0', + min => '0', + max => '2000000000', +}, + # We use the hopefully-safely-small value of 100kB as the compiled-in # default for max_stack_depth. InitializeGUCOptions will increase it # if possible, depending on the actual platform-specific stack limit. diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample index e4abe6c0077..0f728d87b6c 100644 --- a/src/backend/utils/misc/postgresql.conf.sample +++ b/src/backend/utils/misc/postgresql.conf.sample @@ -351,6 +351,8 @@ #wal_keep_size = 0 # in megabytes; 0 disables #max_slot_wal_keep_size = -1 # in megabytes; -1 disables #idle_replication_slot_timeout = 0 # in seconds; 0 disables +#max_slot_xid_age = 0 # maximum XID age before a replication slot + # gets invalidated; 0 disables #wal_sender_timeout = 60s # in milliseconds; 0 disables #track_commit_timestamp = off # collect timestamp of transaction commit # (change requires restart) diff --git a/src/include/replication/slot.h b/src/include/replication/slot.h index 4b4709f6e2c..83cf8438724 100644 --- a/src/include/replication/slot.h +++ b/src/include/replication/slot.h @@ -66,10 +66,12 @@ typedef enum ReplicationSlotInvalidationCause RS_INVAL_WAL_LEVEL = (1 << 2), /* idle slot timeout has occurred */ RS_INVAL_IDLE_TIMEOUT = (1 << 3), + /* slot's xmin or catalog_xmin has reached max xid age */ + RS_INVAL_XID_AGE = (1 << 4), } ReplicationSlotInvalidationCause; /* Maximum number of invalidation causes */ -#define RS_INVAL_MAX_CAUSES 4 +#define RS_INVAL_MAX_CAUSES 5 /* * When the slot synchronization worker is running, or when @@ -326,6 +328,7 @@ extern PGDLLIMPORT ReplicationSlot *MyReplicationSlot; extern PGDLLIMPORT int max_replication_slots; extern PGDLLIMPORT char *synchronized_standby_slots; extern PGDLLIMPORT int idle_replication_slot_timeout_secs; +extern PGDLLIMPORT int max_slot_xid_age; /* shmem initialization functions */ extern Size ReplicationSlotsShmemSize(void); @@ -367,7 +370,8 @@ extern void ReplicationSlotsDropDBSlots(Oid dboid); extern bool InvalidateObsoleteReplicationSlots(uint32 possible_causes, XLogSegNo oldestSegno, Oid dboid, - TransactionId snapshotConflictHorizon); + TransactionId snapshotConflictHorizon, + TransactionId nextXID); extern ReplicationSlot *SearchNamedReplicationSlot(const char *name, bool need_lock); extern int ReplicationSlotIndex(ReplicationSlot *slot); extern bool ReplicationSlotName(int index, Name name); @@ -387,4 +391,6 @@ extern bool SlotExistsInSyncStandbySlots(const char *slot_name); extern bool StandbySlotsHaveCaughtup(XLogRecPtr wait_for_lsn, int elevel); extern void WaitForStandbyConfirmation(XLogRecPtr wait_for_lsn); +extern bool InvalidateXIDAgedReplicationSlots(TransactionId oldestXmin, TransactionId nextXID); + #endif /* SLOT_H */ diff --git a/src/test/recovery/t/019_replslot_limit.pl b/src/test/recovery/t/019_replslot_limit.pl index 7b253e64d9c..f4dfd0064c7 100644 --- a/src/test/recovery/t/019_replslot_limit.pl +++ b/src/test/recovery/t/019_replslot_limit.pl @@ -540,4 +540,170 @@ is( $publisher4->safe_psql( $publisher4->stop; $subscriber4->stop; +# Advance XIDs, run VACUUM, and wait for a slot to be invalidated due to XID age. +sub invalidate_slot_by_xid_age +{ + my ($node, $table_name, $slot_name, $slot_type, $nxids) = @_; + + # Do some work to advance xids + $node->safe_psql( + 'postgres', qq[ + do \$\$ + begin + for i in 1..$nxids loop + -- use an exception block so that each iteration eats an XID + begin + insert into $table_name values (i); + exception + when division_by_zero then null; + end; + end loop; + end\$\$; + ]); + + # Trigger slot invalidation via VACUUM + $node->safe_psql('postgres', "VACUUM"); + + # Wait for the replication slot to be invalidated due to XID age. + $node->poll_query_until( + 'postgres', qq[ + SELECT COUNT(slot_name) = 1 FROM pg_replication_slots + WHERE slot_name = '$slot_name' AND + active = false AND + invalidation_reason = 'xid_aged'; + ]) + or die + "Timed out while waiting for slot $slot_name to be invalidated"; + + ok(1, "$slot_type replication slot invalidated due to XID age"); +} + +# ============================================================================= +# Testcase start: Invalidate streaming standby's slot due to max_slot_xid_age +# GUC. + +# Initialize primary node for XID age tests +my $primary5 = PostgreSQL::Test::Cluster->new('primary5'); +$primary5->init(allows_streaming => 'logical'); + +# Configure primary with XID age settings +my $max_slot_xid_age = 500; +$primary5->append_conf( + 'postgresql.conf', qq{ +max_slot_xid_age = $max_slot_xid_age +}); + +$primary5->start; + +# Take a backup for creating standby +$backup_name = 'backup5'; +$primary5->backup($backup_name); + +# Create a standby linking to the primary using the replication slot +my $standby5 = PostgreSQL::Test::Cluster->new('standby5'); +$standby5->init_from_backup($primary5, $backup_name, has_streaming => 1); + +# Enable HS feedback. The slot should gain an xmin. We set the status interval +# so we'll see the results promptly. +$standby5->append_conf( + 'postgresql.conf', q{ +primary_slot_name = 'sb5_slot' +hot_standby_feedback = on +wal_receiver_status_interval = 1 +max_standby_streaming_delay = 3600000 +}); + +$primary5->safe_psql( + 'postgres', qq[ + SELECT pg_create_physical_replication_slot(slot_name := 'sb5_slot', immediately_reserve := true); +]); + +$standby5->start; + +# Create some content on primary to move xmin +$primary5->safe_psql('postgres', + "CREATE TABLE tab_int5 AS SELECT generate_series(1,10) AS a"); + +# Wait until standby has replayed enough data +$primary5->wait_for_catchup($standby5); + +$primary5->poll_query_until( + 'postgres', qq[ + SELECT (xmin IS NOT NULL) OR (catalog_xmin IS NOT NULL) + FROM pg_catalog.pg_replication_slots + WHERE slot_name = 'sb5_slot'; +]) or die "Timed out waiting for slot sb5_slot xmin to advance"; + +# Read on standby that causes xmin to be held on slot +my $standby5_session = $standby5->interactive_psql('postgres'); +$standby5_session->query("BEGIN; SET default_transaction_isolation = 'repeatable read'; SELECT * FROM tab_int5;"); + +# Advance XIDs and wait for the slot to be invalidated due to XID age. +# Use 2x the max_slot_xid_age to ensure the slot's xmin age comfortably +# exceeds the configured limit. +invalidate_slot_by_xid_age($primary5, 'tab_int5', 'sb5_slot', 'physical', + 2 * $max_slot_xid_age); + +$standby5_session->quit; +$standby5->stop; + +# Testcase end: Invalidate streaming standby's slot due to max_slot_xid_age +# GUC. +# ============================================================================= + +# ============================================================================= +# Testcase start: Invalidate logical subscriber's slot due to max_slot_xid_age +# GUC. + +# Create a subscriber node +my $subscriber5 = PostgreSQL::Test::Cluster->new('subscriber5'); +$subscriber5->init(allows_streaming => 'logical'); +$subscriber5->start; + +# Create tables on both primary and subscriber +$primary5->safe_psql('postgres', "CREATE TABLE test_tbl5 (id int)"); +$subscriber5->safe_psql('postgres', "CREATE TABLE test_tbl5 (id int)"); + +# Insert some initial data +$primary5->safe_psql('postgres', + "INSERT INTO test_tbl5 VALUES (generate_series(1, 5));"); + +# Setup logical replication +my $primary5_connstr = $primary5->connstr . ' dbname=postgres'; +$primary5->safe_psql('postgres', + "CREATE PUBLICATION pub5 FOR TABLE test_tbl5"); + +$subscriber5->safe_psql('postgres', + "CREATE SUBSCRIPTION sub5 CONNECTION '$primary5_connstr' PUBLICATION pub5 WITH (slot_name = 'lsub5_slot')" +); + +# Wait for initial sync to complete +$subscriber5->wait_for_subscription_sync($primary5, 'sub5'); + +$result = $subscriber5->safe_psql('postgres', "SELECT count(*) FROM test_tbl5"); +is($result, qq(5), "check initial copy was done for logical replication (XID age test)"); + +# Wait for the logical slot to get catalog_xmin (logical slots use catalog_xmin, not xmin) +$primary5->poll_query_until( + 'postgres', qq[ + SELECT xmin IS NULL AND catalog_xmin IS NOT NULL + FROM pg_catalog.pg_replication_slots + WHERE slot_name = 'lsub5_slot'; +]) or die "Timed out waiting for slot lsub5_slot catalog_xmin to advance"; + +# Stop subscriber to make the replication slot on primary inactive +$subscriber5->stop; + +# Advance XIDs and wait for the slot to be invalidated due to XID age. +# Use 2x the max_slot_xid_age to ensure the slot's catalog_xmin age +# comfortably exceeds the configured limit. +invalidate_slot_by_xid_age($primary5, 'test_tbl5', 'lsub5_slot', 'logical', + 2 * $max_slot_xid_age); + +$primary5->stop; + +# Testcase end: Invalidate logical subscriber's slot due to max_slot_xid_age +# GUC. +# ============================================================================= + done_testing(); -- 2.47.3