[GitHub] [kafka] dajac commented on a diff in pull request #11965: KAFKA-13778: Fetch from follower should never run the preferred read replica selection

[GitBox <gi...@apache.org>]

dajac commented on code in PR #11965:
URL: https://github.com/apache/kafka/pull/11965#discussion_r841628203


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core/src/main/scala/kafka/server/ReplicaManager.scala:
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@@ -1234,8 +1234,9 @@ class ReplicaManager(val config: KafkaConfig,
                                fetchOffset: Long,
                                currentTimeMs: Long): Option[Int] = {
     partition.leaderReplicaIdOpt.flatMap { leaderReplicaId =>
-      // Don't look up preferred for follower fetches via normal replication
-      if (Request.isValidBrokerId(replicaId))
+      // Don't look up preferred for follower fetches via normal replication and
+      // don't look up preferred read replica while fetch from follower replica
+      if (Request.isValidBrokerId(replicaId) || partition.leaderIdIfLocal.isEmpty)

Review Comment:
   It would be better to directly use `leaderIdIfLocal` at L1236: `partition.leaderIdIfLocal.flatMap { leaderReplicaId =>`.



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