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Amit Kapila

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Fix memory leak in SnapBuildSerialize.

The memory for the snapshot was leaked while serializing it to disk duringlogical decoding. This memory will be freed only once walsender stopsstreaming the changes. This can lead to a huge memory increase when masterlogs Standby Snapshot too frequently say when the user is trying to createmany replication slots.Reported-by: funnyxj.fxj@alibaba-inc.comDiagnosed-by: funnyxj.fxj@alibaba-inc.comAuthor: Amit KapilaBackpatch-through: 9.5Discussion:https://postgr.es/m/033ab54c-6393-42ee-8ec9-2b399b5d8cde.funnyxj.fxj@alibaba-inc.com

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src/backend/replication/logical
- snapbuild.c

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`‎src/backend/replication/logical/snapbuild.c`

Lines changed: 4 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1447,7 +1447,7 @@ static void`
`1447`	`1447`	`SnapBuildSerialize(SnapBuild*builder,XLogRecPtrlsn)`
`1448`	`1448`	`{`
`1449`	`1449`	`Sizeneeded_length;`
`1450`		`-SnapBuildOnDisk*ondisk;`
	`1450`	`+SnapBuildOnDisk*ondisk=NULL;`
`1451`	`1451`	`char*ondisk_c;`
`1452`	`1452`	`intfd;`
`1453`	`1453`	`chartmppath[MAXPGPATH];`
`@@ -1639,6 +1639,9 @@ SnapBuildSerialize(SnapBuild *builder, XLogRecPtr lsn)`
`1639`	`1639`	`out:`
`1640`	`1640`	`ReorderBufferSetRestartPoint(builder->reorder,`
`1641`	`1641`	`builder->last_serialized_snapshot);`
	`1642`	`+/* be tidy */`
	`1643`	`+if (ondisk)`
	`1644`	`+pfree(ondisk);`
`1642`	`1645`	`}`
`1643`	`1646`
`1644`	`1647`	`/*`

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Commit4bcccea

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`‎src/backend/replication/logical/snapbuild.c`

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