From: Heikki Linnakangas <heikki@enterprisedb.com>
Date: Thu, 28 May 2009 11:02:16 +0000 (+0000)
Subject: When archiving is enabled, rotate the last WAL segment at shutdown so that
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When archiving is enabled, rotate the last WAL segment at shutdown so that
all transactions are archived.

Original patch by Guillaume Smet.
---

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 1b575e242a..64e8ead74c 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -6085,7 +6085,18 @@ ShutdownXLOG(int code, Datum arg)
 	if (RecoveryInProgress())
 		CreateRestartPoint(CHECKPOINT_IS_SHUTDOWN | CHECKPOINT_IMMEDIATE);
 	else
+	{
+		/*
+		 * If archiving is enabled, rotate the last XLOG file so that all the
+		 * remaining records are archived (postmaster wakes up the archiver
+		 * process one more time at the end of shutdown). The checkpoint
+		 * record will go to the next XLOG file and won't be archived (yet).
+		 */
+		if (XLogArchivingActive() && XLogArchiveCommandSet())
+			RequestXLogSwitch();
+
 		CreateCheckPoint(CHECKPOINT_IS_SHUTDOWN | CHECKPOINT_IMMEDIATE);
+	}
 	ShutdownCLOG();
 	ShutdownSUBTRANS();
 	ShutdownMultiXact();