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Support invalidating replication slots due to horizon and wal_level

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Needed for logical decoding on a standby. Slots need to be invalidated because
of the horizon if rows required for logical decoding are removed. If the
primary's wal_level is lowered from 'logical', logical slots on the standby
need to be invalidated.

The new invalidation methods will be used in a subsequent commit.

Logical slots that have been invalidated can be identified via the new
pg_replication_slots.conflicting column.

See 6af1793954 for an overall design of logical decoding on a standby.

Bumps catversion for the addition of the new pg_replication_slots column.

Author: "Drouvot, Bertrand" <bertranddrouvot.pg@gmail.com>
Author: Andres Freund <andres@anarazel.de>
Author: Amit Khandekar <amitdkhan.pg@gmail.com> (in an older version)
Reviewed-by: "Drouvot, Bertrand" <bertranddrouvot.pg@gmail.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Reviewed-by: Robert Haas <robertmhaas@gmail.com>
Reviewed-by: Fabrízio de Royes Mello <fabriziomello@gmail.com>
Reviewed-by: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Reviewed-by: Melanie Plageman <melanieplageman@gmail.com>
Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/20230407075009.igg7be27ha2htkbt@awork3.anarazel.de
This commit is contained in:
Andres Freund
2023-04-07 22:40:27 -07:00
parent 2ed16aacf1
commit be87200efd
10 changed files with 176 additions and 37 deletions
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8
src/backend/access/transam/xlog.c
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@@ -6809,7 +6809,9 @@ CreateCheckPoint(int flags)
*/
XLByteToSeg(RedoRecPtr, _logSegNo, wal_segment_size);
KeepLogSeg(recptr, &_logSegNo);
if (InvalidateObsoleteReplicationSlots(_logSegNo))
if (InvalidateObsoleteReplicationSlots(RS_INVAL_WAL_REMOVED,
_logSegNo, InvalidOid,
InvalidTransactionId))
{
/*
* Some slots have been invalidated; recalculate the old-segment
@@ -7253,7 +7255,9 @@ CreateRestartPoint(int flags)
replayPtr = GetXLogReplayRecPtr(&replayTLI);
endptr = (receivePtr < replayPtr) ? replayPtr : receivePtr;
KeepLogSeg(endptr, &_logSegNo);
if (InvalidateObsoleteReplicationSlots(_logSegNo))
if (InvalidateObsoleteReplicationSlots(RS_INVAL_WAL_REMOVED,
_logSegNo, InvalidOid,
InvalidTransactionId))
{
/*
* Some slots have been invalidated; recalculate the old-segment