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From "Mingjie Lai (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8247) Auto-HA: add a config to enable auto-HA, which disables manual FC
Date Fri, 13 Apr 2012 23:37:18 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13253872#comment-13253872
] 

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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