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Commit05172f1

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committed
Don't repeatedly register cache callbacks in pgoutput plugin.
Multiple cycles of starting up and shutting down the plugin within asingle session would eventually lead to "out of relcache_callback_listslots", because pgoutput_startup blindly re-registered its cachecallbacks each time. Fix it to register them only once, as all otherusers of cache callbacks already take care to do.This has been broken all along, so back-patch to all supported branches.Shi YuDiscussion:https://postgr.es/m/OSZPR01MB631004A78D743D68921FFAD3FDA79@OSZPR01MB6310.jpnprd01.prod.outlook.com
1 parent0da243f commit05172f1

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+22
-4
lines changed

1 file changed

+22
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‎src/backend/replication/pgoutput/pgoutput.c

Lines changed: 22 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -409,6 +409,7 @@ pgoutput_startup(LogicalDecodingContext *ctx, OutputPluginOptions *opt,
409409
boolis_init)
410410
{
411411
PGOutputData*data=palloc0(sizeof(PGOutputData));
412+
staticboolpublication_callback_registered= false;
412413

413414
/* Create our memory context for private allocations. */
414415
data->context=AllocSetContextCreate(ctx->context,
@@ -504,9 +505,18 @@ pgoutput_startup(LogicalDecodingContext *ctx, OutputPluginOptions *opt,
504505
/* Init publication state. */
505506
data->publications=NIL;
506507
publications_valid= false;
507-
CacheRegisterSyscacheCallback(PUBLICATIONOID,
508-
publication_invalidation_cb,
509-
(Datum)0);
508+
509+
/*
510+
* Register callback for pg_publication if we didn't already do that
511+
* during some previous call in this process.
512+
*/
513+
if (!publication_callback_registered)
514+
{
515+
CacheRegisterSyscacheCallback(PUBLICATIONOID,
516+
publication_invalidation_cb,
517+
(Datum)0);
518+
publication_callback_registered= true;
519+
}
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511521
/* Initialize relation schema cache. */
512522
init_rel_sync_cache(CacheMemoryContext);
@@ -1745,7 +1755,7 @@ pgoutput_origin_filter(LogicalDecodingContext *ctx,
17451755
* Shutdown the output plugin.
17461756
*
17471757
* Note, we don't need to clean the data->context and data->cachectx as
1748-
* they are childcontext of the ctx->context soit will be cleaned up by
1758+
* they are childcontexts of the ctx->context sothey will be cleaned up by
17491759
* logical decoding machinery.
17501760
*/
17511761
staticvoid
@@ -1931,7 +1941,9 @@ static void
19311941
init_rel_sync_cache(MemoryContextcachectx)
19321942
{
19331943
HASHCTLctl;
1944+
staticboolrelation_callbacks_registered= false;
19341945

1946+
/* Nothing to do if hash table already exists */
19351947
if (RelationSyncCache!=NULL)
19361948
return;
19371949

@@ -1946,6 +1958,10 @@ init_rel_sync_cache(MemoryContext cachectx)
19461958

19471959
Assert(RelationSyncCache!=NULL);
19481960

1961+
/* No more to do if we already registered callbacks */
1962+
if (relation_callbacks_registered)
1963+
return;
1964+
19491965
/* We must update the cache entry for a relation after a relcache flush */
19501966
CacheRegisterRelcacheCallback(rel_sync_cache_relation_cb, (Datum)0);
19511967

@@ -1968,6 +1984,8 @@ init_rel_sync_cache(MemoryContext cachectx)
19681984
CacheRegisterSyscacheCallback(PUBLICATIONNAMESPACEMAP,
19691985
rel_sync_cache_publication_cb,
19701986
(Datum)0);
1987+
1988+
relation_callbacks_registered= true;
19711989
}
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19731991
/*

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