squah-confluent commented on code in PR #18224:
URL: https://github.com/apache/kafka/pull/18224#discussion_r1909868558
##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java:
##########
@@ -984,27 +984,36 @@ private boolean
validateOnlineDowngradeWithReplacedMemberId(
* Creates a ClassicGroup corresponding to the given ConsumerGroup.
*
* @param consumerGroup The converted ConsumerGroup.
- * @param leavingMemberId The leaving member that triggers the downgrade
validation.
+ * @param leavingMemberIds The leaving member(s) that triggered the
downgrade validation.
* @param joiningMember The newly joined member if the downgrade is
triggered by static member replacement.
+ * When not null, leavingMemberIds must contain
the single member being replaced.
* @param records The record list to which the conversion
records are added.
*/
private void convertToClassicGroup(
ConsumerGroup consumerGroup,
- String leavingMemberId,
+ Set<String> leavingMemberIds,
ConsumerGroupMember joiningMember,
List<CoordinatorRecord> records
) {
+ if (joiningMember != null && leavingMemberIds.size() != 1) {
+ throw new IllegalArgumentException(
+ String.format("joiningMember is not null, but leavingMemberIds
contains %d members.", leavingMemberIds.size())
+ );
+ }
Review Comment:
I gave that a try. Let me know what you think.
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