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From "Hari Mankude (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, 06 Apr 2012 22:04:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13248917#comment-13248917
] 

Hari Mankude commented on HADOOP-8247:
--------------------------------------

Can we make this simpler by not supporting manual failover? 
                
> 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
>         Attachments: 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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