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From "Eli Collins (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7938) HA: the FailoverController should optionally fence the active during failover
Date Tue, 24 Jan 2012 22:24:41 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13192621#comment-13192621

Eli Collins commented on HADOOP-7938:

Forgot to mention, the failover state machine would be a little simpler if we always required
that a fencer be configured, however I left it as is for now. Reasonable future change?
> 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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