chia7712 commented on code in PR #17444:
URL: https://github.com/apache/kafka/pull/17444#discussion_r1820499608


##########
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:
   wait a second, the above comment is not accurate. Please ignore it before I 
get my clear mind back. 



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