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Fix memory leak in SnapBuildSerialize.

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The memory for the snapshot was leaked while serializing it to disk during
logical decoding. This memory will be freed only once walsender stops
streaming the changes. This can lead to a huge memory increase when master
logs Standby Snapshot too frequently say when the user is trying to create
many replication slots.

Reported-by: funnyxj.fxj@alibaba-inc.com
Diagnosed-by: funnyxj.fxj@alibaba-inc.com
Author: Amit Kapila
Backpatch-through: 9.5
Discussion: https://postgr.es/m/033ab54c-6393-42ee-8ec9-2b399b5d8cde.funnyxj.fxj@alibaba-inc.com
This commit is contained in:
Amit Kapila 2021-01-13 08:31:45 +05:30
parent a2c5a430a9
commit 636b6f99c2
1 changed files with 4 additions and 1 deletions
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5
src/backend/replication/logical/snapbuild.c
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@ -1486,7 +1486,7 @@ static void
SnapBuildSerialize(SnapBuild *builder, XLogRecPtr lsn)
{
Size needed_length;
SnapBuildOnDisk *ondisk;
SnapBuildOnDisk *ondisk = NULL;
char *ondisk_c;
int fd;
char tmppath[MAXPGPATH];
@ -1682,6 +1682,9 @@ SnapBuildSerialize(SnapBuild *builder, XLogRecPtr lsn)
out:
ReorderBufferSetRestartPoint(builder->reorder,
builder->last_serialized_snapshot);
/* be tidy */
if (ondisk)
pfree(ondisk);
}
/*