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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8279) Auto-HA: Allow manual failover to be invoked from zkfc.
Date Tue, 01 May 2012 20:42:55 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13266067#comment-13266067
] 

Todd Lipcon commented on HADOOP-8279:
-------------------------------------

Hari: yes, it gracefully transitions the NN to standby state, and doesn't cause fencing. Fencing
onyl results if the previous active has crashed (i.e. not responding to the request). Please
refer to the design doc referenced in the description of the JIRA.
                
> 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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