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From "Philip Zeyliger (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3071) haadmin failover command does not provide enough detail for when target NN is not ready to be active
Date Fri, 09 Mar 2012 01:45:57 GMT
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


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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