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From "Aaron T. Myers (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3071) haadmin failover command does not provide enough detail for when target NN is not ready to be active
Date Fri, 23 Mar 2012 02:10:27 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13236279#comment-13236279
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Aaron T. Myers commented on HDFS-3071:
--------------------------------------

The latest patch looks good to me, +1. I like the new tests you added.
                
> haadmin failover command does not provide enough detail for when target NN is not ready
to be active
> ----------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-3071
>                 URL: https://issues.apache.org/jira/browse/HDFS-3071
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: ha
>    Affects Versions: 0.24.0
>            Reporter: Philip Zeyliger
>            Assignee: Todd Lipcon
>         Attachments: hdfs-3071.txt, hdfs-3071.txt, hdfs-3071.txt, hdfs-3071.txt, hdfs-3071.txt,
hdfs-3071.txt
>
>
> When running the failover command, you can get an error message like the following:
> {quote}
> $ hdfs --config $(pwd) haadmin -failover namenode2 namenode1
> Failover failed: xxx.yyy/1.2.3.4:8020 is not ready to become active
> {quote}
> Unfortunately, the error message doesn't describe why that node isn't ready to be active.
 In my case, the target namenode's logs don't indicate anything either. It turned out that
the issue was "Safe mode is ON.Resources are low on NN. Safe mode must be turned off manually.",
but ideally the user would be told that at the time of the failover.

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