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