Support more than one truncate in transaction

knizhnik · kelvich · commit 241d31dd998f · 2017-11-13T02:17:39.000+03:00
diff --git a/multimaster.c b/multimaster.c
@@ -2144,7 +2144,9 @@ static void
 MtmLockCluster(void)
 {
 	timestamp_t delay = MIN_WAIT_TIMEOUT;
-	Assert(!MtmClusterLocked);
+	if (MtmClusterLocked) { 
+		MtmUnlockCluster();
+	}
 	MtmLock(LW_EXCLUSIVE);
 	if (BIT_CHECK(Mtm->originLockNodeMask, MtmNodeId-1)) {
 		elog(ERROR, "There is already pending exclusive lock");
