Treate globaltablespace relations as local in backend's snapshot

Author: knizhnik

src/backend/storage/buffer/bufmgr.c

@@ -712,7 +712,7 @@ ReadBuffer_common(SMgrRelation smgr, char relpersistence, ForkNumber forkNum,
 	bool		isExtend;
 	bool		isLocalBuf;
 
-	if (sfs_backend_snapshot != SFS_INVALID_SNAPSHOT && smgr->smgr_rnode.node.spcNode != GLOBALTABLESPACE_OID)
+	if (sfs_backend_snapshot != SFS_INVALID_SNAPSHOT)
 	{
 		/* Do not use shared buffers: treat all relations as local */
 		isLocalBuf = true;

src/backend/storage/ipc/procarray.c

@@ -807,9 +807,12 @@ ProcArrayApplyRecoveryInfo(RunningTransactions running)
 		/*
 		 * Add the sorted snapshot into KnownAssignedXids
 		 */
-		for (i = 0; i < nxids; i++)
-			KnownAssignedXidsAdd(xids[i], xids[i], true);
-
+		KnownAssignedXidsAdd(xids[0], xids[0], true);
+		for (i = 1; i < nxids; i++)
+		{
+			if (xids[i] != xids[i-1])
+				KnownAssignedXidsAdd(xids[i], xids[i], true);
+		}
 		KnownAssignedXidsDisplay(trace_recovery(DEBUG3));
 	}