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https://issues.apache.org/jira/browse/MAPREDUCE-5059?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sandy Ryza resolved MAPREDUCE-5059.
-----------------------------------
Resolution: Fixed
> 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: 2.1.0-beta, 0.23.8
>
> 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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