jolshan commented on code in PR #15968:
URL: https://github.com/apache/kafka/pull/15968#discussion_r2072162665


##########
core/src/main/scala/kafka/server/KafkaApis.scala:
##########
@@ -396,57 +396,72 @@ class KafkaApis(val requestChannel: RequestChannel,
       }
     }
 
-    val unauthorizedTopicResponses = mutable.Map[TopicPartition, 
PartitionResponse]()
-    val nonExistingTopicResponses = mutable.Map[TopicPartition, 
PartitionResponse]()
-    val invalidRequestResponses = mutable.Map[TopicPartition, 
PartitionResponse]()
-    val authorizedRequestInfo = mutable.Map[TopicPartition, MemoryRecords]()
+    val unauthorizedTopicResponses = mutable.Map[TopicIdPartition, 
PartitionResponse]()
+    val nonExistingTopicResponses = mutable.Map[TopicIdPartition, 
PartitionResponse]()
+    val invalidRequestResponses = mutable.Map[TopicIdPartition, 
PartitionResponse]()
+    val authorizedRequestInfo = mutable.Map[TopicIdPartition, MemoryRecords]()
+    val topicIdToPartitionData = new mutable.ArrayBuffer[(TopicIdPartition, 
ProduceRequestData.PartitionProduceData)]
+
+    produceRequest.data.topicData.forEach { topic =>
+      topic.partitionData.forEach { partition =>
+        val (topicName, topicId) = if (topic.topicId().equals(Uuid.ZERO_UUID)) 
{
+          (topic.name(), metadataCache.getTopicId(topic.name()))
+        } else {
+          (metadataCache.getTopicName(topic.topicId).orElse(topic.name), 
topic.topicId())
+        }
+
+        val topicPartition = new TopicPartition(topicName, partition.index())
+        if (topicName.isEmpty)
+          nonExistingTopicResponses += new TopicIdPartition(topicId, 
topicPartition) -> new PartitionResponse(Errors.UNKNOWN_TOPIC_ID)
+        else if (!metadataCache.contains(topicPartition))
+          nonExistingTopicResponses += new TopicIdPartition(topicId, 
topicPartition) -> new PartitionResponse(Errors.UNKNOWN_TOPIC_OR_PARTITION)

Review Comment:
   I also see that this is a slightly different case, so makes sense. 👍 



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