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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3854) Implement a fence method which should fence the BK shared storage.
Date Sat, 01 Sep 2012 18:59:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13446778#comment-13446778
] 

Uma Maheswara Rao G commented on HDFS-3854:
-------------------------------------------

Per the discussion in HDFS-3862, we may disable the fencing option with single writer storage.
                
> Implement a fence method which should fence the BK shared storage.
> ------------------------------------------------------------------
>
>                 Key: HDFS-3854
>                 URL: https://issues.apache.org/jira/browse/HDFS-3854
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>            Reporter: Uma Maheswara Rao G
>
> Currently when machine down or network down, SSHFence can not ensure that, other node
is completely down. So, fence will fail and switch will not happen.
> [ internally we did work around to return true when machine is not reachable, as BKJM
already has fencing]
> It may be good idea to implement a fence method, which should ensure shared storage fenced
propertly and return true.
> We can plug in this new method in ZKFC fence methods.
> only pain points what I can see is, we may have to put the BKJM jar in ZKFC lib for running
this fence method.
> thoughts?

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