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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-5059) Job overview shows average merge time larger than for any reduce attempt
Date Thu, 11 Apr 2013 22:31:17 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5059?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinod Kumar Vavilapalli updated MAPREDUCE-5059:
-----------------------------------------------

       Resolution: Fixed
    Fix Version/s: 2.0.5-beta
     Hadoop Flags: Reviewed
           Status: Resolved  (was: Patch Available)

I just committed this to trunk and branch-2. Thanks Omkar!
                
> Job overview shows average merge time larger than for any reduce attempt
> ------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5059
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5059
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: jobhistoryserver, webapps
>            Reporter: Jason Lowe
>            Assignee: Omkar Vinit Joshi
>             Fix For: 2.0.5-beta
>
>         Attachments: MAPREDUCE-5059-20130325.patch, MAPREDUCE-5059-20130410.patch
>
>
> When looking at a job overview page on the history server, the Average Merge Time is
often reported with a value that is far larger than the Elapsed Merge Time shown for any reduce
task attempt.  The job overview page calculates the merge time as the time delta between the
sort finishing and the job launching while the attempts page calculates it as the time delta
between the sort finishing and the shuffle finishing.

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