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Fix LagTrackerRead() for timeline increments

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Bug was masked by error in running 004_timeline_switch.pl that was
fixed recently in 7d68f2281a.

Detective work by Alvaro Herrera and Tom Lane

Author: Thomas Munro
This commit is contained in:
Simon Riggs 2017-04-23 21:35:41 +01:00
parent 0874d4f3e1
commit 8463880872
1 changed files with 10 additions and 1 deletions
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11
src/backend/replication/walsender.c
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@ -3328,7 +3328,16 @@ LagTrackerRead(int head, XLogRecPtr lsn, TimestampTz now)
WalTimeSample prev = LagTracker.last_read[head]; WalTimeSample prev = LagTracker.last_read[head];
WalTimeSample next = LagTracker.buffer[LagTracker.read_heads[head]]; WalTimeSample next = LagTracker.buffer[LagTracker.read_heads[head]];
Assert(lsn >= prev.lsn); if (lsn < prev.lsn)
{
/*
* Reported LSNs shouldn't normally go backwards, but it's
* possible when there is a timeline change. Treat as not
* found.
*/
return -1;
}
Assert(prev.lsn < next.lsn); Assert(prev.lsn < next.lsn);
if (prev.time > next.time) if (prev.time > next.time)