philipnee commented on code in PR #14357:
URL: https://github.com/apache/kafka/pull/14357#discussion_r1361474872


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/MembershipManagerImpl.java:
##########
@@ -135,6 +146,7 @@ public void updateState(ConsumerGroupHeartbeatResponseData 
response) {
     public void transitionToFenced() {
         resetEpoch();
         transitionTo(MemberState.FENCED);
+        assignmentReconciler.startLost();

Review Comment:
   I think this is actually fine, because the heartbeat won't be sent in the 
FENCED state. I see that completeLost() is invoked after the callback completes 
- there I think we can ask the member to rejoin by invoking tryJoin() (which is 
in my PR).
   
   Technically - The member should try to rejoin after being fenced, but 
there's no guarantee to it. In this case - we rely on callback completion 
signal to ask the member to rejoin.  This is what i meant.



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