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https://issues.apache.org/jira/browse/HDFS-8161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15229865#comment-15229865
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Brahma Reddy Battula commented on HDFS-8161:
--------------------------------------------
Hi [~johnjianfang]
This particular case was caused by ZOOKEEPER-2175.
If your case also similar to this, then have to wait till ZOOKEEPER-2175 makes
some progress
> Both Namenodes are in standby State
> -----------------------------------
>
> Key: HDFS-8161
> URL: https://issues.apache.org/jira/browse/HDFS-8161
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: auto-failover
> Affects Versions: 2.6.0
> Reporter: Brahma Reddy Battula
> Assignee: Brahma Reddy Battula
> Attachments: ACTIVEBreadcumb and StandbyElector.txt
>
>
> Suspected Scenario:
> ================
> Start cluster with three Nodes.
> Reboot Machine where ZKFC is not running..( Here Active Node ZKFC should open
> session with this ZK )
> Now ZKFC ( Active NN's ) session expire and try re-establish connection with
> another ZK...Bythe time ZKFC ( StndBy NN's ) will try to fence old active
> and create the active Breadcrumb and Makes SNN to active state..
> But immediately it fence to standby state.. ( Here is the doubt)
> Hence both will be in standby state..
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