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From "Todd Lipcon (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (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 22:32:22 GMT

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

Todd Lipcon updated HDFS-3071:
------------------------------

    Attachment: hdfs-3071.txt

Attached patch updates the javadoc for getServiceStatus.

I didn't use GenericTestUtils in that test, because the test was in Common whereas GenericTestUtils
is in HDFS. Might be worth moving but didn't want to pollute this patch with the move.

I'll run the HA tests locally and also run through the manual test scenario again.
                
> 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
>
>
> 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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