peterxcli commented on code in PR #17444:
URL: https://github.com/apache/kafka/pull/17444#discussion_r1820799880
##########
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/Utils.java:
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@@ -235,4 +238,20 @@ public static ApiMessage
messageOrNull(ApiMessageAndVersion apiMessageAndVersion
return apiMessageAndVersion.message();
}
}
+
+ public static long hashSubscriptionMetadata(Map<String, TopicMetadata>
subscriptionMetadata) {
Review Comment:
@FrankYang0529
Is he saying that whenever
[`consumerGroupHeartbeat`](https://github.com/frankyang0529/kafka/blob/2ff4c89b8e88ec1170ab698cb016e33564724909/group-coordinator/src/main/java/org/apache/kafka/coordinator/group/GroupMetadataManager.java#L1796-L1813)
is called, it’s necessary to recompute the hash for the incoming `<groupName,
topicMetadata>` map? This would mean recalculating the hash for either each
group name’s individual metadata or for the entire map, which is indeed quite
time-consuming.
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