soarez commented on code in PR #14881:
URL: https://github.com/apache/kafka/pull/14881#discussion_r1420873183


##########
metadata/src/main/java/org/apache/kafka/image/TopicDelta.java:
##########
@@ -158,11 +160,21 @@ public LocalReplicaChanges localChanges(int brokerId) {
                         new LocalReplicaChanges.PartitionInfo(id(), 
entry.getValue())
                     );
                     topicIds.putIfAbsent(name(), id());
+                    updateDirectoryIds(brokerId, entry, prevPartition, 
directoryIds);

Review Comment:
   We should only add the directoryId as a local change if `prevPartition == 
null || prevPartition.directory(brokerId) != 
entry.getValue().directory(brokerId)`. So this change should be outside of the 
leader/follower conditions.
   
   Also I think the info we want/need is a map of 
`org.apache.kafka.common.TopicIdPartition` (which already includes the topicId 
– it's always present in KRaft mode) to `Uuid` (the directoryId in the 
metadata). We can get these as:
   
   ```java
   if (Replicas.contains(entry.getValue().replicas, brokerId)) {
     PartitionRegistration prevPartition = 
image.partitions().get(entry.getKey());
     if (prevPartition == null || prevPartition.directory(brokerId) != 
entry.getValue().directory(brokerId)) {
         directoryIds.put(
                 new TopicIdPartition(id(), entry.getKey(), name()),
                 entry.getValue().directory(brokerId)
         );
     }
   }
   ```



##########
metadata/src/main/java/org/apache/kafka/image/TopicDelta.java:
##########
@@ -158,11 +160,21 @@ public LocalReplicaChanges localChanges(int brokerId) {
                         new LocalReplicaChanges.PartitionInfo(id(), 
entry.getValue())
                     );
                     topicIds.putIfAbsent(name(), id());
+                    updateDirectoryIds(brokerId, entry, prevPartition, 
directoryIds);

Review Comment:
   We should only add the directoryId as a local change if `prevPartition == 
null || prevPartition.directory(brokerId) != 
entry.getValue().directory(brokerId)`. So this change should be outside of the 
leader/follower conditions.
   
   Also I think the info we want/need is a map of 
`org.apache.kafka.common.TopicIdPartition` (which already includes the topicId 
– it's always present in KRaft mode) to `Uuid` (the directoryId in the 
metadata). We can get these as:
   
   ```java
   if (Replicas.contains(entry.getValue().replicas, brokerId)) {
     PartitionRegistration prevPartition = 
image.partitions().get(entry.getKey());
     if (prevPartition == null || prevPartition.directory(brokerId) != 
entry.getValue().directory(brokerId)) {
         directoryIds.put(
                 new TopicIdPartition(id(), entry.getKey(), name()),
                 entry.getValue().directory(brokerId)
         );
     }
   }
   ```



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