chia7712 commented on code in PR #17444:
URL: https://github.com/apache/kafka/pull/17444#discussion_r1818002951
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group-coordinator/src/main/java/org/apache/kafka/coordinator/group/modern/TopicMetadata.java:
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@@ -41,10 +41,25 @@ public class TopicMetadata {
*/
private final int numPartitions;
+ /**
+ * Map of every partition Id to a set of its rack Ids, if they exist.
+ * If rack information is unavailable for all partitions, this is an empty
map.
+ */
+ private final Map<Integer, Set<String>> partitionRacks;
Review Comment:
@FrankYang0529 Sorry for opening too many discussions here. As @dajac
suggested, it might be good to create a KIP. You could summarize the four
possible solutions and move the discussion to the dev channel.
There are two approaches from the JIRA: one from me (optimizing the
structure), and yours (leveraging topic delta).
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