[jira] [Commented] (KAFKA-6371) FetchMetadata creates unneeded Strings on instantiation

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-6371?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16375782#comment-16375782 ] 

ASF GitHub Bot commented on KAFKA-6371:
---------------------------------------

hachikuji closed pull request #4328: KAFKA-6371 Fix DelayedFetch toString
URL: https://github.com/apache/kafka/pull/4328
 
 
   

This is a PR merged from a forked repository.
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diff --git a/core/src/main/scala/kafka/server/DelayedFetch.scala b/core/src/main/scala/kafka/server/DelayedFetch.scala
index a05131ae8c6..ae3cf46595c 100644
--- a/core/src/main/scala/kafka/server/DelayedFetch.scala
+++ b/core/src/main/scala/kafka/server/DelayedFetch.scala
@@ -44,10 +44,8 @@ case class FetchMetadata(fetchMinBytes: Int,
                          replicaId: Int,
                          fetchPartitionStatus: Seq[(TopicPartition, FetchPartitionStatus)]) {
 
-  override def toString = "[minBytes: " + fetchMinBytes + ", " +
-                          "onlyLeader:" + fetchOnlyLeader + ", "
-                          "onlyCommitted: " + fetchOnlyCommitted + ", "
-                          "partitionStatus: " + fetchPartitionStatus + "]"
+  override def toString = s"[minBytes: $fetchMinBytes, onlyLeader: $fetchOnlyLeader, " +
+                          s"onlyCommitted: $fetchOnlyCommitted, partitionStatus: $fetchPartitionStatus]"
 }
 /**
  * A delayed fetch operation that can be created by the replica manager and watched


 

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> FetchMetadata creates unneeded Strings on instantiation
> -------------------------------------------------------
>
>                 Key: KAFKA-6371
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6371
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 0.10.0.1, 0.10.1.1, 0.10.2.1
>            Reporter: Maytee Chinavanichkit
>            Assignee: Maytee Chinavanichkit
>            Priority: Minor
>             Fix For: 0.10.0.2, 0.10.1.2, 0.10.2.2
>
>
> My colleague and I were taking a heap dump to investigate the memory usage of a broker. From the dump, we saw a number of object strings with the message {{onlyCommitted: <redacted>}} and {{partitionStatus: <redacted>]}}. Upon investigation, these objects were being instantiated when the {{FetchMetadata}} object is constructed. The toString method here is malformed and the last two lines are executed as a block instead of being concatenated. 



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