dongnuo123 commented on code in PR #17008:
URL: https://github.com/apache/kafka/pull/17008#discussion_r1734847464
##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -2047,6 +2061,10 @@ private CoordinatorResult<Void, CoordinatorRecord>
classicGroupJoinToConsumerGro
scheduleConsumerGroupSyncTimeout(groupId, response.memberId(),
request.rebalanceTimeoutMs());
responseFuture.complete(response);
+
+ // Maybe downgrade the consumer group if the last member using
the
+ // consumer protocol is replaced by the joining member.
+ scheduleConsumerGroupDowngradeTimeout(groupId);
Review Comment:
I guess we can have something like
```
if (validateDowngrade(group)) {
scheduleDowngrade(groupId)
}
```
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