ijuma commented on a change in pull request #11331:
URL: https://github.com/apache/kafka/pull/11331#discussion_r728096221



##########
File path: core/src/main/scala/kafka/server/KafkaApis.scala
##########
@@ -708,40 +701,41 @@ class KafkaApis(val requestChannel: RequestChannel,
       None
     }
 
-    val erroneous = mutable.ArrayBuffer[(TopicPartition, 
FetchResponseData.PartitionData)]()
-    val interesting = mutable.ArrayBuffer[(TopicPartition, 
FetchRequest.PartitionData)]()
-    val sessionTopicIds = mutable.Map[String, Uuid]()
+    val erroneous = mutable.ArrayBuffer[(TopicIdPartition, 
FetchResponseData.PartitionData)]()
+    val interesting = mutable.ArrayBuffer[(TopicIdPartition, 
FetchRequest.PartitionData)]()
     if (fetchRequest.isFromFollower) {
       // The follower must have ClusterAction on ClusterResource in order to 
fetch partition data.
       if (authHelper.authorize(request.context, CLUSTER_ACTION, CLUSTER, 
CLUSTER_NAME)) {
-        fetchContext.foreachPartition { (topicPartition, topicId, data) =>
-          sessionTopicIds.put(topicPartition.topic(), topicId)
-          if (!metadataCache.contains(topicPartition))
-            erroneous += topicPartition -> 
FetchResponse.partitionResponse(topicPartition.partition, 
Errors.UNKNOWN_TOPIC_OR_PARTITION)
+        fetchContext.foreachPartition { (topicIdPartition, data) =>
+          if (topicIdPartition.topicPartition.topic == null )

Review comment:
       Hmm, how does my PR affect this?

##########
File path: core/src/main/scala/kafka/server/KafkaApis.scala
##########
@@ -708,40 +701,41 @@ class KafkaApis(val requestChannel: RequestChannel,
       None
     }
 
-    val erroneous = mutable.ArrayBuffer[(TopicPartition, 
FetchResponseData.PartitionData)]()
-    val interesting = mutable.ArrayBuffer[(TopicPartition, 
FetchRequest.PartitionData)]()
-    val sessionTopicIds = mutable.Map[String, Uuid]()
+    val erroneous = mutable.ArrayBuffer[(TopicIdPartition, 
FetchResponseData.PartitionData)]()
+    val interesting = mutable.ArrayBuffer[(TopicIdPartition, 
FetchRequest.PartitionData)]()
     if (fetchRequest.isFromFollower) {
       // The follower must have ClusterAction on ClusterResource in order to 
fetch partition data.
       if (authHelper.authorize(request.context, CLUSTER_ACTION, CLUSTER, 
CLUSTER_NAME)) {
-        fetchContext.foreachPartition { (topicPartition, topicId, data) =>
-          sessionTopicIds.put(topicPartition.topic(), topicId)
-          if (!metadataCache.contains(topicPartition))
-            erroneous += topicPartition -> 
FetchResponse.partitionResponse(topicPartition.partition, 
Errors.UNKNOWN_TOPIC_OR_PARTITION)
+        fetchContext.foreachPartition { (topicIdPartition, data) =>
+          if (topicIdPartition.topicPartition.topic == null )

Review comment:
       We should probably remove that non null check, since it's weird to have 
it only in that one path. I can submit a PR.




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