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From "Haibo Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-6657) job history server can fail on startup when NameNode is in start phase
Date Tue, 19 Apr 2016 00:49:25 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6657?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15246860#comment-15246860
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Haibo Chen commented on MAPREDUCE-6657:
---------------------------------------

Thanks a lot for you comments, [~templedf] I have added a brief javadoc and made the timeout
to be 500. Let me know if 500 looks reasonable to you. 
Also, the test method is now using the existing dfs cluster instead of a new local one. The
only method in TestHistoryManager that is using is both dfs clusters is testCreateDirsWithAdditionalFileSystem(),
so maybe it makes more sense to move that method out? 
The behavior of JHS, when name node is in safe mode, is that it throws a YarnRuntimeException
with a timeout message. I think the assert message is actually in line with the expected behavior.

> job history server can fail on startup when NameNode is in start phase
> ----------------------------------------------------------------------
>
>                 Key: MAPREDUCE-6657
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6657
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobhistoryserver
>            Reporter: Haibo Chen
>            Assignee: Haibo Chen
>         Attachments: mapreduce6657.001.patch, mapreduce6657.002.patch
>
>
> Job history server will try to create a history directory in HDFS on startup. When NameNode
is in safe mode, it will keep retrying for a configurable time period.  However, it should
also keeps retrying if the name node is in start state. Safe mode does not happen until the
NN is out of the startup phase. 
> A RetriableException with the text "NameNode still not started" is thrown when the NN
is in its internal service startup phase. We should add the check for this specific exception
in isBecauseSafeMode() to account for that.



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