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Use full 64-bit XID for checking if a deleted GiST page is old enough.

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Otherwise, after a deleted page gets even older, it becomes unrecyclable
again. B-tree has the same problem, and has had since time immemorial,
but let's at least fix this in GiST, where this is new.

Backpatch to v12, where GiST page deletion was introduced.

Reviewed-by: Andrey Borodin
Discussion: https://www.postgresql.org/message-id/835A15A5-F1B4-4446-A711-BF48357EB602%40yandex-team.ru
This commit is contained in:
Heikki Linnakangas
2019-07-24 20:24:07 +03:00
parent e2e992c931
commit fb5344c969
9 changed files with 134 additions and 28 deletions
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3
src/include/utils/snapmgr.h
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@ -13,6 +13,7 @@
#ifndef SNAPMGR_H
#define SNAPMGR_H
#include "access/transam.h"
#include "fmgr.h"
#include "utils/relcache.h"
#include "utils/resowner.h"
@ -122,6 +123,8 @@ extern void UnregisterSnapshot(Snapshot snapshot);
extern Snapshot RegisterSnapshotOnOwner(Snapshot snapshot, ResourceOwner owner);
extern void UnregisterSnapshotFromOwner(Snapshot snapshot, ResourceOwner owner);
extern FullTransactionId GetFullRecentGlobalXmin(void);
extern void AtSubCommit_Snapshot(int level);
extern void AtSubAbort_Snapshot(int level);
extern void AtEOXact_Snapshot(bool isCommit, bool resetXmin);