dajac commented on code in PR #15176:
URL: https://github.com/apache/kafka/pull/15176#discussion_r1454773095


##########
core/src/main/scala/kafka/coordinator/group/GroupCoordinator.scala:
##########
@@ -935,8 +935,9 @@ private[group] class GroupCoordinator(
           producerId,
           producerEpoch,
           RecordBatch.NO_SEQUENCE,
-          requestLocal,
-          postVerificationCallback
+          // Wrap the callback to be handled on an arbitrary request handler 
thread
+          // when transaction verification is complete.
+          KafkaRequestHandler.wrapAsyncCallback(postVerificationCallback, 
requestLocal)

Review Comment:
   We still need this in the old coordinator.



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