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https://issues.apache.org/jira/browse/KAFKA-1504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14042245#comment-14042245
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Guozhang Wang commented on KAFKA-1504:
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This may be due to KAFKA-1382.
You can verify by checking if there is a ZK session timeout in the log.
> Replica is unable to update ISR
> -------------------------------
>
> Key: KAFKA-1504
> URL: https://issues.apache.org/jira/browse/KAFKA-1504
> Project: Kafka
> Issue Type: Bug
> Components: replication
> Affects Versions: 0.8.1
> Environment: Windows Server 2012; JDK 1.7.0
> Reporter: Jie Tong
> Assignee: Neha Narkhede
>
> We ran into this issue relatively frequent: replica cannot update ISR and
> thus fall out of the ISR and result in the # of replicas in ISR < replication
> factor. A restart of broker can mitigate the issue.
> Below is the error log:
> e,06/22/2014
> 20:29:20,Logging,kafka.utils.Logging$class,SrcFile="Logging.scala"
> SrcFunc="error" SrcLine="97" Pid="1952" Tid="8852" TS="0x01CF8E935200FDAF"
> String1="Conditional update of path
> /brokers/topics/RTUserCount/partitions/60/state with data
> {'controller_epoch':44,'leader':3690877,'version':1,'leader_epoch':110,'isr':[3690877]}
> and expected version 230 failed due to
> org.apache.zookeeper.KeeperException$BadVersionException: KeeperErrorCode =
> BadVersion for /brokers/topics/RTUserCount/partitions/60/state"
> i,06/22/2014
> 20:29:20,Logging,kafka.utils.Logging$class,SrcFile="Logging.scala"
> SrcFunc="info" SrcLine="68" Pid="1952" Tid="8852" TS="0x01CF8E93520124BC"
> String1="Partition [RTUserCount,60] on broker 3690877: Cached zkVersion [230]
> not equal to that in zookeeper, skip updating ISR"
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