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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8161) Both Namenodes are in standby State
Date Thu, 16 Apr 2015 17:07:59 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8161?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Brahma Reddy Battula updated HDFS-8161:
---------------------------------------
    Description: 
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..

  was:
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..


> Both Namenodes are in standby State
> -----------------------------------
>
>                 Key: HDFS-8161
>                 URL: https://issues.apache.org/jira/browse/HDFS-8161
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            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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