abbccdda commented on a change in pull request #9084:
URL: https://github.com/apache/kafka/pull/9084#discussion_r460671888



##########
File path: 
clients/src/main/java/org/apache/kafka/clients/consumer/internals/ConsumerCoordinator.java
##########
@@ -728,7 +728,11 @@ protected void onJoinPrepare(int generation, String 
memberId) {
         subscriptions.resetGroupSubscription();
 
         if (exception != null) {
-            throw new KafkaException("User rebalance callback throws an 
error", exception);
+            if (exception instanceof KafkaException) {
+                throw (KafkaException) exception;

Review comment:
       Why do we need this cast?




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