FrankYang0529 commented on code in PR #19611:
URL: https://github.com/apache/kafka/pull/19611#discussion_r2095290200
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group-coordinator/src/main/java/org/apache/kafka/coordinator/group/modern/SubscribedTopicDescriberImpl.java:
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@@ -79,49 +81,65 @@ public int numPartitions(Uuid topicId) {
*/
@Override
public Set<String> racksForPartition(Uuid topicId, int partition) {
+ TopicImage topic = metadataImage.topics().getTopic(topicId);
+ if (topic != null) {
+ PartitionRegistration partitionRegistration =
topic.partitions().get(partition);
+ if (partitionRegistration != null) {
+ Set<String> racks = new HashSet<>();
+ for (int replica : partitionRegistration.replicas) {
+ // Only add the rack if it is available for the
broker/replica.
+
metadataImage.cluster().broker(replica).rack().ifPresent(racks::add);
Review Comment:
We do null check in hash function. It's better to add the check here.
https://github.com/apache/kafka/blob/ce4940f9891a96819e54f8db097ce3824876e8e5/group-coordinator/src/main/java/org/apache/kafka/coordinator/group/Utils.java#L408-L413
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