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https://issues.apache.org/jira/browse/HADOOP-8247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13253872#comment-13253872
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Mingjie Lai commented on HADOOP-8247:
-------------------------------------
I overlooked the jira so just found the discussion here.
The problem of this jira is that it makes the auto and manual failover
*exclusive* to each other. While in section 2.7.2 of the design doc at
https://issues.apache.org/jira/browse/HDFS-2185, a manual failover is supposed
to be handled by zkfc if the auto failover configure is on. That proposal makes
it possible that we can perform a manual failover for upgrade purposes, while
having auto failover to prevent a nn failure.
I will open another jira to address the above issue. However I foresee the
behaviour of manual failover will be changed since it will be allowed no matter
auto failover is turned on or not.
> Auto-HA: add a config to enable auto-HA, which disables manual FC
> -----------------------------------------------------------------
>
> Key: HADOOP-8247
> URL: https://issues.apache.org/jira/browse/HADOOP-8247
> Project: Hadoop Common
> Issue Type: Improvement
> Components: auto-failover, ha
> Affects Versions: Auto Failover (HDFS-3042)
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Fix For: Auto Failover (HDFS-3042)
>
> Attachments: hadoop-8247.txt, hadoop-8247.txt, hadoop-8247.txt,
> hadoop-8247.txt, hadoop-8247.txt, hadoop-8247.txt
>
>
> Currently, if automatic failover is set up and running, and the user uses the
> "haadmin -failover" command, he or she can end up putting the system in an
> inconsistent state, where the state in ZK disagrees with the actual state of
> the world. To fix this, we should add a config flag which is used to enable
> auto-HA. When this flag is set, we should disallow use of the haadmin command
> to initiate failovers. We should refuse to run ZKFCs when the flag is not
> set. Of course, this flag should be scoped by nameservice.
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