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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7938) HA: the FailoverController should optionally fence the active during failover
Date Sat, 28 Jan 2012 02:07:10 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13195349#comment-13195349
] 

Todd Lipcon commented on HADOOP-7938:
-------------------------------------

Another question - if you call transitionToStandby on a node that's already in standby, is
it a no-op or does it throw an exception? If the latter, we need to fix that, or else the
"failover" command wouldn't be safe to use when both NNs are in SB mode after startup.
                
> HA: the FailoverController should optionally fence the active during failover
> -----------------------------------------------------------------------------
>
>                 Key: HADOOP-7938
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7938
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>             Fix For: HA Branch (HDFS-1623)
>
>         Attachments: hadoop-7938.txt, hadoop-7938.txt
>
>
> The FailoverController in HADOOP-7924 needs to be able to fence off the current active
in case it fails to transition to standby (or the user requests it for sanity). This is needed
even for manual failover (the CLI should use the configured fencing mechanism). The FC needs
to access the HDFS-specific implementations HDFS-2179, could add a common fencing interface
(or just shell out but we may not always want to do that).

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