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From "Rakesh R (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3854) Implement a fence method which should fence the BK shared storage.
Date Wed, 20 May 2015 13:06:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14552283#comment-14552283
] 

Rakesh R commented on HDFS-3854:
--------------------------------

[~umamaheswararao] like you mentioned, HDFS-3862 has a proposal to skip the fencer logic as
BK has already a built-in fencing mechanism. Can I close this issue ?

> 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: namenode
>            Reporter: Uma Maheswara Rao G
>            Assignee: Rakesh R
>
> 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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