dongnuo123 commented on code in PR #15662:
URL: https://github.com/apache/kafka/pull/15662#discussion_r1560320708
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group-coordinator/src/main/java/org/apache/kafka/coordinator/group/consumer/ConsumerGroup.java:
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@@ -180,12 +192,19 @@ public static class DeadlineAndEpoch {
*/
private DeadlineAndEpoch metadataRefreshDeadline = DeadlineAndEpoch.EMPTY;
+ /**
+ * Map of protocol names to the number of members that use legacy protocol
and support them.
+ */
+ private final TimelineHashMap<String, Integer>
legacyProtocolMembersSupportedProtocols;
Review Comment:
We will need it to check if at least one of the given protocols in the
`JoinGroupRequest` can be supported if a consumer using the classic protocol
joins the group.
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