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From "Jason Lowe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-5059) Job overview shows average merge time larger than for any reduce attempt
Date Tue, 12 Mar 2013 19:11:13 GMT
Jason Lowe created MAPREDUCE-5059:
-------------------------------------

             Summary: 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


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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