philipnee commented on code in PR #15035:
URL: https://github.com/apache/kafka/pull/15035#discussion_r1431731425


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/MembershipManagerImpl.java:
##########
@@ -672,7 +672,11 @@ public void onHeartbeatRequestSent() {
         MemberState state = state();
         if (isStaled()) {
             log.debug("Member {} is staled and is therefore leaving the group. 
 It will rejoin upon the next poll.", memberEpoch);
-            transitionToJoining();
+            // clear the current assignment and subscription, and trigger 
rebalance listener on the next poll
+            
invokeOnPartitionsRevokedCallback(subscriptions.assignedPartitions()).whenComplete((r,
 e) -> {

Review Comment:
   I agree.  We had a bit of discussion around this.  I think whether calling 
onPartitionLost/Revoke is up for discussion. Perhaps we limit the scope of the 
change to just clearing the assignment subscription w/o invoking the callbacks.



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