jolshan commented on a change in pull request #11170:
URL: https://github.com/apache/kafka/pull/11170#discussion_r711204996



##########
File path: core/src/main/scala/kafka/server/ReplicaManager.scala
##########
@@ -1755,6 +1762,40 @@ class ReplicaManager(val config: KafkaConfig,
     partitionsToMakeFollower
   }
 
+  private def updateTopicIdForFollowers(controllerId: Int,
+                                        controllerEpoch: Int,
+                                        partitionStates: Set[Partition],
+                                        correlationId: Int,
+                                        topicIds: String => Option[Uuid]): 
Unit = {
+    val traceLoggingEnabled = stateChangeLogger.isTraceEnabled
+
+    try {
+      if (isShuttingDown.get()) {
+        if (traceLoggingEnabled) {
+          partitionStates.foreach { partition =>
+            stateChangeLogger.trace(s"Skipped the update topic ID step of the 
become-follower state " +
+              s"change with correlation id $correlationId from controller 
$controllerId epoch $controllerEpoch for " +
+              s"partition ${partition.topicPartition} since it is shutting 
down")
+          }
+        }
+      } else {
+        val partitionsToUpdateFollowerWithLeader = partitionStates.map { 
partition =>
+          val leaderNode = partition.leaderReplicaIdOpt.flatMap(leaderId => 
metadataCache.
+            getAliveBrokerNode(leaderId, 
config.interBrokerListenerName)).getOrElse(Node.noNode())
+          val leaderId = leaderNode.id

Review comment:
       Ah I see. I thought I copied the check from makeFollowers, but I guess I 
didn't. And I thought I removed the extra work to get the ID, but looks like 
there was still an unnecessary step. 😅




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