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https://issues.apache.org/jira/browse/HDFS-15023?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16987578#comment-16987578
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Fei Hui commented on HDFS-15023:
--------------------------------

[~ayushtkn] Thanks for your comments. I had a mistake. I shouldn't change the 
fix mentioned on HDFS-14961
Upload v002 patch with UT 

> [SBN read] ZKFC should check the state before joining the election
> ------------------------------------------------------------------
>
>                 Key: HDFS-15023
>                 URL: https://issues.apache.org/jira/browse/HDFS-15023
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Fei Hui
>            Assignee: Fei Hui
>            Priority: Major
>         Attachments: HDFS-15023.001.patch
>
>
> As discussed HDFS-14961, ZKFC should not join election when its state is 
> observer.
> Right now when namemode was an observer,  it joined election and it would be 
> become a standby.
> MonitorDaemon thread callchain is that
> doHealthChecks -> enterState(State.SERVICE_HEALTHY) -> recheckElectability() 
> -> elector.joinElection(targetToData(localTarget)) -> joinElectionInternal -> 
> createLockNodeAsync
> callBack for zookeeper
> processResult -> becomeStandby



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