doc updates

Author: kelvich

src/commit.c

@@ -146,9 +146,18 @@ MtmBeginTransaction()
 		/* Reject all user's transactions at offline cluster.
 		 * Allow execution of transaction by bg-workers to makeit possible to perform recovery.
 		 */
-		mtm_log(ERROR,
-				"Multimaster node is not online: current status %s",
-				MtmNodeStatusMnem[Mtm->status]);
+		if (!MtmBreakConnection)
+		{
+			mtm_log(ERROR,
+					"Multimaster node is not online: current status %s",
+					MtmNodeStatusMnem[Mtm->status]);
+		}
+		else
+		{
+			mtm_log(FATAL,
+					"Multimaster node is not online: current status %s",
+					MtmNodeStatusMnem[Mtm->status]);
+		}
 	}
 }
 

src/include/multimaster.h

@@ -250,6 +250,7 @@ extern int	MtmHeartbeatRecvTimeout;
 extern char *MtmRefereeConnStr;
 extern int	MtmMaxWorkers;
 extern int	MtmMaxNodes;
+extern bool	MtmBreakConnection;
 
 /*  XXX! need rename: that's actually a disconnectivity mask */
 #define SELF_CONNECTIVITY_MASK  (Mtm->selfConnectivityMask)

src/multimaster.c

@@ -135,6 +135,7 @@ int	  MtmTransSpillThreshold; // XXX: align with receiver buffer size
 int	  MtmHeartbeatSendTimeout;
 int	  MtmHeartbeatRecvTimeout;
 char* MtmRefereeConnStr;
+bool  MtmBreakConnection;
 
 static int	 MtmQueueSize;
 
@@ -551,6 +552,19 @@ _PG_init(void)
 		NULL		 /* GucShowHook show_hook */
 	);
 
+	DefineCustomBoolVariable(
+		"multimaster.break_connection",
+		"Break connection with client when node is no online",
+		NULL,
+		&MtmBreakConnection,
+		false,
+		PGC_BACKEND,
+		0,
+		NULL,
+		NULL,
+		NULL
+	);
+
 	MtmDeadlockDetectorInit(MtmMaxNodes);
 
 	/*