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https://issues.apache.org/jira/browse/HDFS-3207?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13248455#comment-13248455
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Philip Zeyliger commented on HDFS-3207:
---------------------------------------

The difference is that one would try the failover as if fencing was configured 
to shell(true) and the other wouldn't even do the RPC shutdown.  You make a 
good point; they could be strung together reasonably.
                
> Mechanism for HA failover to ignore fencing errors
> --------------------------------------------------
>
>                 Key: HDFS-3207
>                 URL: https://issues.apache.org/jira/browse/HDFS-3207
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: ha
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Philip Zeyliger
>            Assignee: Todd Lipcon
>
> If an administrator wants to ignore fencing (perhaps because he knows that 
> the other namenode has been taken out of comission for sure, but the fencing 
> is ssh-based), there should be a flag to the failover command to allow this.

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