chia7712 commented on code in PR #17444:
URL: https://github.com/apache/kafka/pull/17444#discussion_r1817694063
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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:
According to @dajac's comment
(https://github.com/apache/kafka/pull/17444#discussion_r1816397624), it seems
the assignor should generate no-op assignments for consumers when the
subscribed topics haven't changed. However, I'm not sure if all assignors are
expected to produce deterministic results. I know many balancing algorithms
rely on random search, which means they may not generate the same assignment
even with the same subscribed topics.
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