dongnuo123 commented on code in PR #22457:
URL: https://github.com/apache/kafka/pull/22457#discussion_r3351554013
##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
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@@ -1394,6 +1394,34 @@ private void validateOnlineUpgrade(ClassicGroup
classicGroup) {
}
}
+ /**
+ * Validates whether a new classic member is allowed to join the consumer
group.
+ * If the migration policy is disabled, the join request will be rejected,
unless
+ * the classic member is static and it replaces an existing consumer
member in
+ * the consumer group.
Review Comment:
Not too sure about it here. We have an existing unit test
`testJoiningConsumerGroupReplacingExistingStaticMember` that tests this path
with disabled policy so we still allow this case here
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