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https://issues.apache.org/jira/browse/KAFKA-5877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16176332#comment-16176332
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Dong Lin commented on KAFKA-5877:
---------------------------------
[~tombentley] Cool. Thanks!
> Controller should only update reassignment znode if there is change in the
> reassignment data
> --------------------------------------------------------------------------------------------
>
> Key: KAFKA-5877
> URL: https://issues.apache.org/jira/browse/KAFKA-5877
> Project: Kafka
> Issue Type: Bug
> Reporter: Dong Lin
> Assignee: Dong Lin
> Fix For: 1.0.0
>
>
> I encountered a scenario where controller keeps printing the following stack
> trace repeatedly for a finite set of partitions. Although I have not fully
> figured out the cause of this event, it seems that controller will update the
> reassignment znode even if the new data is same as existing data. This patch
> optimizes the controller behavior by only updating reassignment znode if it
> needs to change the reassignment znode data.
> 2017/09/12 20:34:05.842 [KafkaController] [Controller 1376005]: Error
> completing reassignment of partition [FederatorResultEvent,202]
> kafka.common.KafkaException: Partition [FederatorResultEvent,202] to be
> reassigned is already assigned to replicas 1367001,1384010,1386010. Ignoring
> request for partition reassignment
> at
> kafka.controller.KafkaController.initiateReassignReplicasForTopicPartition(KafkaController.scala:608)
> ~[kafka_2.10-0.11.0.9.jar:?]
> at
> kafka.controller.KafkaController$PartitionReassignment$$anonfun$process$14.apply(KafkaController.scala:1327)
> ~[kafka_2.10-0.11.0.9.jar:?]
> at
> kafka.controller.KafkaController$PartitionReassignment$$anonfun$process$14.apply(KafkaController.scala:1320)
> ~[kafka_2.10-0.11.0.9.jar:?]
> at
> scala.collection.immutable.HashMap$HashMap1.foreach(HashMap.scala:224)
> ~[scala-library-2.10.4.jar:?]
> at
> scala.collection.immutable.HashMap$HashTrieMap.foreach(HashMap.scala:403)
> ~[scala-library-2.10.4.jar:?]
> at
> scala.collection.immutable.HashMap$HashTrieMap.foreach(HashMap.scala:403)
> ~[scala-library-2.10.4.jar:?]
> at
> kafka.controller.KafkaController$PartitionReassignment.process(KafkaController.scala:1320)
> ~[kafka_2.10-0.11.0.9.jar:?]
> at
> kafka.controller.ControllerEventManager$ControllerEventThread$$anonfun$doWork$1.apply$mcV$sp(ControllerEventManager.scala:53)
> ~[kafka_2.10-0.11.0.9.jar:?]
> at
> kafka.controller.ControllerEventManager$ControllerEventThread$$anonfun$doWork$1.apply(ControllerEventManager.scala:53)
> ~[kafka_2.10-0.11.0.9.jar:?]
> at
> kafka.controller.ControllerEventManager$ControllerEventThread$$anonfun$doWork$1.apply(ControllerEventManager.scala:53)
> ~[kafka_2.10-0.11.0.9.jar:?]
> at kafka.metrics.KafkaTimer.time(KafkaTimer.scala:31)
> ~[kafka_2.10-0.11.0.9.jar:?]
> at
> kafka.controller.ControllerEventManager$ControllerEventThread.doWork(ControllerEventManager.scala:52)
> ~[kafka_2.10-0.11.0.9.jar:?]
> at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:64)
> ~[kafka_2.10-0.11.0.9.jar:?]
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