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Posted to dev@kafka.apache.org by "Dong Lin (JIRA)" <ji...@apache.org> on 2017/10/05 08:59:01 UTC
[jira] [Resolved] (KAFKA-5877) Controller should only update
reassignment znode if there is change in the reassignment data
[ https://issues.apache.org/jira/browse/KAFKA-5877?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dong Lin resolved KAFKA-5877.
-----------------------------
Resolution: Fixed
> 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: 1.1.0
>
>
> 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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