FrankYang0529 commented on code in PR #18801:
URL: https://github.com/apache/kafka/pull/18801#discussion_r1941434808


##########
core/src/main/scala/kafka/server/metadata/KRaftMetadataCache.scala:
##########
@@ -345,68 +344,69 @@ class KRaftMetadataCache(
     
Option(_currentImage.cluster.broker(brokerId)).count(_.inControlledShutdown) == 
1
   }
 
-  override def getAliveBrokers(): Iterable[BrokerMetadata] = 
getAliveBrokers(_currentImage)
+  override def getAliveBrokers(): util.List[BrokerMetadata] = 
getAliveBrokers(_currentImage)
 
-  private def getAliveBrokers(image: MetadataImage): Iterable[BrokerMetadata] 
= {
+  private def getAliveBrokers(image: MetadataImage): util.List[BrokerMetadata] 
= {
     image.cluster().brokers().values().asScala.filterNot(_.fenced()).
       map(b => new BrokerMetadata(b.id, b.rack))
-  }
+  }.toList.asJava
 
-  override def getAliveBrokerNode(brokerId: Int, listenerName: ListenerName): 
Option[Node] = {
-    Option(_currentImage.cluster().broker(brokerId)).filterNot(_.fenced()).
-      flatMap(_.node(listenerName.value()).toScala)
+  override def getAliveBrokerNode(brokerId: Int, listenerName: ListenerName): 
util.Optional[Node] = {
+    util.Optional.ofNullable(_currentImage.cluster().broker(brokerId))
+      .filter(broker => !broker.fenced())
+      .flatMap(broker => broker.node(listenerName.value()))
   }
 
-  override def getAliveBrokerNodes(listenerName: ListenerName): Seq[Node] = {
+  override def getAliveBrokerNodes(listenerName: ListenerName): 
util.List[Node] = {
     _currentImage.cluster().brokers().values().asScala.filterNot(_.fenced()).

Review Comment:
   Thanks for the suggestion. I will update it tomorrow.



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