kirktrue commented on code in PR #14357:
URL: https://github.com/apache/kafka/pull/14357#discussion_r1362776957


##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/MembershipManagerImpl.java:
##########
@@ -248,4 +261,28 @@ public void 
updateAssignment(ConsumerGroupHeartbeatResponseData.Assignment assig
         }
         maybeTransitionToStable();
     }
+
+    @Override
+    public void completeReconcile(Set<TopicPartition> revokedPartitions,
+                                  Set<TopicPartition> assignedPartitions,
+                                  Optional<KafkaException> callbackError) {
+        if (callbackError.isPresent()) {
+            // TODO: how to react to callback errors?
+        }
+
+        assignmentReconciler.completeReconcile(revokedPartitions, 
assignedPartitions);
+        transitionTo(MemberState.STABLE);
+        // TODO: update state to signal the HeartbeatRequestManager to send an 
ACK heartbeat
+    }
+
+    @Override
+    public void completeLost(Set<TopicPartition> lostPartitions, 
Optional<KafkaException> callbackError) {
+        if (callbackError.isPresent()) {
+            // TODO: how to react to callback errors?
+        }
+
+        assignmentReconciler.completeLost(lostPartitions);
+        transitionTo(MemberState.UNJOINED);
+        // TODO: update state to signal the HeartbeatRequestManager to send an 
ACK heartbeat

Review Comment:
   @dajac @lianetm @philipnee Please take a look at the [state machine 
diagram](https://cwiki.apache.org/confluence/display/KAFKA/Consumer+rebalance#Consumerrebalance-RebalanceStateMachine)
 on the AK wiki.



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