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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 Thu, 22 Mar 2012 06:22:22 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13235394#comment-13235394

Aaron T. Myers commented on HDFS-3071:

Patch looks pretty good, Todd. A few nits:

# I think we should update the method comment of getServiceStatus, at least to do an s/state/status/g,
and perhaps to expand further more generally.
# Why not use GenericTestUtils.assertExceptionContains instead of "ffe.getMessage().contains(...)"

+1 once these are addressed and Jenkins comes back clean.
> 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
> 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/ 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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