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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5641) History for failed Application Masters should be made available to the Job History Server
Date Fri, 14 Feb 2014 16:36:29 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13901600#comment-13901600
] 

Jason Lowe commented on MAPREDUCE-5641:
---------------------------------------

bq. I don't believe that will work either, since the job history and job.xml files are 0600

Sorry, this is incorrect -- I was looking at the wrong files on one of our clusters.  The
job conf and jhist files are 644 by default, so it will work but insecurely.

> History for failed Application Masters should be made available to the Job History Server
> -----------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5641
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5641
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: applicationmaster, jobhistoryserver
>    Affects Versions: 2.2.0
>            Reporter: Robert Kanter
>            Assignee: Robert Kanter
>         Attachments: MAPREDUCE-5641.patch
>
>
> Currently, the JHS has no information about jobs whose AMs have failed.  This is because
the History is written by the AM to the intermediate folder just before finishing, so when
it fails for any reason, this information isn't copied there.  However, it is not lost as
its in the AM's staging directory.  To make the History available in the JHS, all we need
to do is have another mechanism to move the History from the staging directory to the intermediate
directory.  The AM also writes a "Summary" file before exiting normally, which is also unavailable
when the AM fails.  



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