[jira] [Resolved] (HDFS-3071) haadmin failover command does not provide enough detail for when target NN is not ready to be active

["Todd Lipcon (Resolved) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-3071?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon resolved HDFS-3071.
-------------------------------

       Resolution: Fixed
    Fix Version/s: 0.23.2
                   0.24.0
     Hadoop Flags: Reviewed

Committed to trunk and 23. Thanks for reviewing, ATM, and for reporting, Philip.
                
> 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
>             Fix For: 0.24.0, 0.23.2
>
>         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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