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From "Hari Mankude (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8279) Auto-HA: Allow manual failover to be invoked from zkfc.
Date Tue, 01 May 2012 20:40:53 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13266060#comment-13266060
] 

Hari Mankude commented on HADOOP-8279:
--------------------------------------

Todd,

Is the feature going to switch the active NN to standby state or will it result in active
NN getting fenced and hence going away?

thanks
                
> Auto-HA: Allow manual failover to be invoked from zkfc.
> -------------------------------------------------------
>
>                 Key: HADOOP-8279
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8279
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: auto-failover, ha
>    Affects Versions: Auto Failover (HDFS-3042)
>            Reporter: Mingjie Lai
>            Assignee: Todd Lipcon
>             Fix For: Auto Failover (HDFS-3042)
>
>         Attachments: hadoop-8279.txt, hadoop-8279.txt, hadoop-8279.txt, hadoop-8279.txt
>
>
> HADOOP-8247 introduces a configure flag to prevent potential status inconsistency between
zkfc and namenode, by making auto and manual failover mutually exclusive.
> However, as described in 2.7.2 section of design doc at HDFS-2185, we should allow manual
and auto failover co-exist, by:
> - adding some rpc interfaces at zkfc
> - manual failover shall be triggered by haadmin, and handled by zkfc if auto failover
is enabled. 

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