divijvaidya commented on code in PR #13111:
URL: https://github.com/apache/kafka/pull/13111#discussion_r1073623221


##########
core/src/main/scala/kafka/controller/KafkaController.scala:
##########
@@ -1698,7 +1708,7 @@ class KafkaController(val config: KafkaConfig,
   private def processPartitionModifications(topic: String): Unit = {
     def restorePartitionReplicaAssignment(
       topic: String,
-      newPartitionReplicaAssignment: Map[TopicPartition, ReplicaAssignment]
+      newPartitionReplicaAssignment: Set[(TopicPartition, ReplicaAssignment)]

Review Comment:
   we changed the call to Zk from `zkClient.getFullReplicaAssignmentForTopics` 
to `zkClient.getReplicaAssignmentAndTopicIdForTopics` since the former dud not 
provide the topic Id. As a result of this change we needed to use `flatMap` at 
line 1730 and hence it results in a `Set`.
   
   We can work on improving the readibility as you suggested once we have a 
consensus on whether we even want to make this change at all.



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