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Remove remants of "snapshot too old"

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Remove the 'whenTaken' and 'lsn' fields from SnapshotData. After the
removal of the "snapshot too old" feature, they were never set to a
non-zero value.

This largely reverts commit 3e2f3c2e42, which added the
OldestActiveSnapshot tracking, and the init_toast_snapshot()
function. That was only required for setting the 'whenTaken' and 'lsn'
fields. SnapshotToast is now a constant again, like SnapshotSelf and
SnapshotAny. I kept a thin get_toast_snapshot() wrapper around
SnapshotToast though, to check that you have a registered or active
snapshot. That's still a useful sanity check.

Reviewed-by: Nathan Bossart, Andres Freund, Tom Lane
Discussion: https://www.postgresql.org/message-id/cd4b4f8c-e63a-41c0-95f6-6e6cd9b83f6d@iki.fi
This commit is contained in:
Heikki Linnakangas
2024-12-09 18:13:03 +02:00
parent f64ec81a81
commit 4d8275046c
10 changed files with 28 additions and 114 deletions
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4
src/backend/storage/ipc/procarray.c
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@@ -2135,8 +2135,6 @@ GetSnapshotDataReuse(Snapshot snapshot)
snapshot->active_count = 0;
snapshot->regd_count = 0;
snapshot->copied = false;
snapshot->lsn = InvalidXLogRecPtr;
snapshot->whenTaken = 0;
return true;
}
@@ -2516,8 +2514,6 @@ GetSnapshotData(Snapshot snapshot)
snapshot->active_count = 0;
snapshot->regd_count = 0;
snapshot->copied = false;
snapshot->lsn = InvalidXLogRecPtr;
snapshot->whenTaken = 0;
return snapshot;
}