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From "Todd Lipcon (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 23:55:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13253885#comment-13253885

Todd Lipcon commented on HADOOP-8247:

bq. The problem of this jira is that it makes the auto and manual failover exclusive to each

Yes, this is a temporary state along the way. As discussed elsewhere, we need to flip the
manual HA commands over to communicate with the ZKFCs when automatic failover is enabled.
Since that code isn't done yet, the current behavior is to disable 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
>             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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