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From "Todd Lipcon (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7991) HA: the FailoverController should check the standby is ready before failing over
Date Wed, 01 Feb 2012 21:54:58 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13198189#comment-13198189
] 

Todd Lipcon commented on HADOOP-7991:
-------------------------------------

Looks good to me. Did you test the command line on a cluster?
                
> HA: the FailoverController should check the standby is ready before failing over
> --------------------------------------------------------------------------------
>
>                 Key: HADOOP-7991
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7991
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7991.txt
>
>
> The FC in preFailoverChecks should check that the target service is ready for failover
(eg in the case of HDFS, that it's not in SM) before failing over to it. We'll need to provide
a force option as well since the standby may not actually be ready until the failover has
been initiated (eg because becoming active kicks it to check the log and see newly allocated
blocks).

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