mytang0 commented on code in PR #1037:
URL: 
https://github.com/apache/incubator-eventmesh/pull/1037#discussion_r931833513


##########
eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/core/protocol/tcp/client/session/send/UpStreamMsgContext.java:
##########
@@ -92,21 +92,26 @@ public void retry() {
             Command replyCmd = getReplyCmd(header.getCmd());
             long sendTime = System.currentTimeMillis();
 
-            EventMeshTcpSendResult sendStatus = session.upstreamMsg(header, 
event,
-                    createSendCallback(replyCmd, taskExecuteTime, event), 
startTime, taskExecuteTime);
+            retryTimes++;
 
-            if (StringUtils.equals(EventMeshTcpSendStatus.SUCCESS.name(), 
sendStatus.getSendStatus().name())) {
-                
logger.info("pkg|eventMesh2mq|cmd={}|event={}|user={}|wait={}ms|cost={}ms", 
header.getCmd(), event,
+            // check session availability
+            if (session.isAvailable(event.getSubject())) {

Review Comment:
   > If so, then isAvailable needs to be more refined. This modification is 
because the session has been closed, the retry logic is still calling 
session.upstreamMsg, an unnecessary exception occurs, and even an infinite loop.
   
   If so, then isAvailable needs to be more refined. This modification is 
because the session has been closed, the retry logic is still calling 
session.upstreamMsg, an unnecessary exception occurs, and even an infinite loop.



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