rajinisivaram commented on a change in pull request #8986:
URL: https://github.com/apache/kafka/pull/8986#discussion_r451498688



##########
File path: 
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AbstractCoordinator.java
##########
@@ -460,15 +463,21 @@ boolean joinGroupIfNeeded(final Timer timer) {
                     exception instanceof IllegalGenerationException ||
                     exception instanceof MemberIdRequiredException)
                     continue;
-                else if (!future.isRetriable())
-                    throw exception;
-
-                timer.sleep(rebalanceConfig.retryBackoffMs);
+                else {
+                    handleFailure(future, timer);
+                }
             }
         }
         return true;
     }
 
+    protected void handleFailure(RequestFuture<?> future, Timer timer) {
+        if (future.isRetriable() || future.exception() instanceof 
AuthorizationException)

Review comment:
       @abbccdda Thanks for the review. The instance we saw was an 
authorization failure for groups, but since I was fixing handling of all 
responses, I used `AuthorizationException` in the check since we want to ensure 
we backoff for topic authorization exceptions too. We already backoff for 
`RetriableException` and I haven't changed that behaviour, this PR addresses 
exceptions that are not subclasses of `RetriableException`. Perhaps just 
updating `AuthorizationException` as is currently done in the PR is sufficient?




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