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https://issues.apache.org/jira/browse/HDFS-15023?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fei Hui updated HDFS-15023:
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Attachment: HDFS-15023.003.patch
> [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, HDFS-15023.002.patch,
> HDFS-15023.003.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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