machi1990 commented on code in PR #13665:
URL: https://github.com/apache/kafka/pull/13665#discussion_r1230920423


##########
clients/src/test/java/org/apache/kafka/clients/consumer/internals/ConsumerCoordinatorTest.java:
##########
@@ -3818,13 +3899,16 @@ private void gracefulCloseTest(ConsumerCoordinator 
coordinator, boolean shouldLe
             return commitRequest.data().groupId().equals(groupId);
         }, new OffsetCommitResponse(new OffsetCommitResponseData()));
 
+        // add t1p to the committed offset metadata cache, we'll then check 
that the cache is invalidated after revocation which happens during close
+        coordinator.committedOffsetsCache().put(t1p, new 
OffsetAndMetadata(1L));

Review Comment:
   Thanks for pointing this out.  I was thinking along the same lines as well 
but I thought the `close()` case would have covered everything. I ended up 
taking your suggestion and added a verification in the `testRejoinGroup`.



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