Fix timing of Startup CLOG and MultiXact during Hot Standby

Patch by me, bug report by Chris Redekop, analysis by Florian Pflug

1 files changed, 12 insertions, 5 deletions

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 6c18db4050f..906292690d6 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -6067,10 +6067,12 @@ StartupXLOG(void)
 				oldestActiveXID = checkPoint.oldestActiveXid;
 			Assert(TransactionIdIsValid(oldestActiveXID));
 
-			/* Startup commit log and related stuff */
+			/*
+			 * Startup commit log and subtrans only. Other SLRUs are not
+			 * maintained during recovery and need not be started yet.
+			 */
 			StartupCLOG();
 			StartupSUBTRANS(oldestActiveXID);
-			StartupMultiXact();
 
 			/*
 			 * If we're beginning at a shutdown checkpoint, we know that
@@ -6530,16 +6532,21 @@ StartupXLOG(void)
 	TransactionIdRetreat(ShmemVariableCache->latestCompletedXid);
 
 	/*
-	 * Start up the commit log and related stuff, too. In hot standby mode we
-	 * did this already before WAL replay.
+	 * Start up the commit log and subtrans, if not already done for
+	 * hot standby.
 	 */
 	if (standbyState == STANDBY_DISABLED)
 	{
 		StartupCLOG();
 		StartupSUBTRANS(oldestActiveXID);
-		StartupMultiXact();
 	}
 
+	/*
+	 * Perform end of recovery actions for any SLRUs that need it.
+	 */
+	StartupMultiXact();
+	TrimCLOG();
+
 	/* Reload shared-memory state for prepared transactions */
 	RecoverPreparedTransactions();