urbandan commented on code in PR #13975:
URL: https://github.com/apache/kafka/pull/13975#discussion_r1258090035


##########
core/src/main/scala/kafka/server/metadata/KRaftMetadataCache.scala:
##########
@@ -174,14 +174,25 @@ class KRaftMetadataCache(val brokerId: Int) extends 
MetadataCache with Logging w
                                 errorUnavailableEndpoints: Boolean = false,
                                 errorUnavailableListeners: Boolean = false): 
Seq[MetadataResponseTopic] = {
     val image = _currentImage
-    topics.toSeq.flatMap { topic =>
-      getPartitionMetadata(image, topic, listenerName, 
errorUnavailableEndpoints, errorUnavailableListeners).map { partitionMetadata =>
+    if (!isInitialized()) {
+      topics.toSeq.map(topic =>

Review Comment:
   I think that the BROKER_NOT_AVAILABLE should be a top level error for the 
metadata API - e.g. for a metadata request, it doesn't seem correct to report 
it per-partition, when in reality, the broker itself cannot properly serve the 
request at all (it doesn't even know anything about the topics listed in the 
request)



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