etolbakov commented on code in PR #12388:
URL: https://github.com/apache/kafka/pull/12388#discussion_r916752022


##########
clients/src/test/java/org/apache/kafka/clients/consumer/internals/AbstractCoordinatorTest.java:
##########
@@ -1164,6 +1168,34 @@ public void testHandleNormalLeaveGroupResponse() {
         assertTrue(leaveGroupFuture.succeeded());
     }
 
+    @Test
+    public void testHandleNormalLeaveGroupResponseAndTruncatedLeaveReason() {
+        MemberResponse memberResponse = new MemberResponse()
+                                            .setMemberId(memberId)
+                                            .setErrorCode(Errors.NONE.code());
+        LeaveGroupResponse leaveGroupResponse =
+            leaveGroupResponse(Collections.singletonList(memberResponse));
+        String leaveReason = "Very 
looooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong
 leaveReason that is 271 characters long to make sure that length limit logic 
handles the scenario nicely";
+        setupCoordinator(RETRY_BACKOFF_MS, Integer.MAX_VALUE, 
Optional.empty());
+
+        mockClient.prepareResponse(groupCoordinatorResponse(node, 
Errors.NONE));

Review Comment:
   @dajac I've drafted the change for the `KafkaAdminClient` (you've mentioned 
it earlier, sorry overlooked), it feels that the method `truncateIfRequired` 
should be coverted to an util one.
   I'm thinking of putting it in `org.apache.kafka.common.utils.Utils` but 
could you please give any suggestion if there's a more suitable place?



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