squah-confluent commented on code in PR #18046:
URL: https://github.com/apache/kafka/pull/18046#discussion_r1875401870
##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -1053,6 +1055,13 @@ ConsumerGroup convertToConsumerGroup(ClassicGroup
classicGroup, List<Coordinator
throw new GroupIdNotFoundException("Cannot upgrade the classic
group " + classicGroup.groupId() +
" to consumer group because the embedded consumer protocol is
malformed.");
+ } catch (UnsupportedVersionException e) {
+ log.warn("Cannot upgrade the classic group " +
classicGroup.groupId() +
+ " to consumer group: " + e.getMessage() + ".", e);
+
+ throw new GroupIdNotFoundException("Cannot upgrade the classic
group " + classicGroup.groupId() +
+ " to consumer group because a custom assignor with userData is
in use. " +
Review Comment:
Reworded the error to `Cannot upgrade classic group %s to consumer group
because an unsupported custom assignor is in use. Please refer to the
documentation or switch to a default assignor before re-attempting the upgrade.`
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