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commit    7552d3d1aba33198141f4953379f819df23988cf
Author:   Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date:     Wed Mar 05 11:27:18 2014 +0000
First released in: 9.4.0, 9.0.17, 9.1.13, 9.2.8, 9.3.4

    Fix lastReplayedEndRecPtr calculation when starting from shutdown checkpoint.
    
    When entering crash recovery followed by archive recovery, and the latest
    checkpoint is a shutdown checkpoint, and there are no more WAL records to
    replay before transitioning from crash to archive recovery, we would not
    immediately allow read-only connections in hot standby mode even if we
    could. That's because when starting from a shutdown checkpoint, we set
    lastReplayedEndRecPtr incorrectly to the record before the checkpoint
    record, instead of the checkpoint record itself. We don't run the redo
    routine of the shutdown checkpoint record, but starting recovery from it
    goes through the same motions, so it should be considered as replayed.
    
    Reported by Kyotaro HORIGUCHI. All versions with hot standby are affected,
    so backpatch to 9.0.


 src/backend/access/transam/xlog.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 32e208c7c72..4041ab4051e 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -6508,11 +6508,15 @@ StartupXLOG(void)
 
 		/*
 		 * Initialize shared variables for tracking progress of WAL replay,
-		 * as if we had just replayed the record before the REDO location.
+		 * as if we had just replayed the record before the REDO location
+		 * (or the checkpoint record itself, if it's a shutdown checkpoint).
 		 */
 		SpinLockAcquire(&xlogctl->info_lck);
-		xlogctl->replayEndRecPtr = checkPoint.redo;
-		xlogctl->lastReplayedEndRecPtr = checkPoint.redo;
+		if (XLByteLT(checkPoint.redo, RecPtr))
+			xlogctl->replayEndRecPtr = checkPoint.redo;
+		else
+			xlogctl->replayEndRecPtr = EndRecPtr;
+		xlogctl->lastReplayedEndRecPtr = xlogctl->replayEndRecPtr;
 		xlogctl->recoveryLastXTime = 0;
 		xlogctl->recoveryPause = false;
 		SpinLockRelease(&xlogctl->info_lck);


[parent: a9eb4924a581]