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From "Jothi Padmanabhan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-956) Shuffle should be broken down to only two phases (copy/reduce) instead of three (copy/sort/reduce)
Date Sat, 05 Sep 2009 04:42:58 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-956?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jothi Padmanabhan updated MAPREDUCE-956:
----------------------------------------

          Component/s: task
    Affects Version/s: 0.21.0

> Shuffle should be broken down to only two phases (copy/reduce) instead of three (copy/sort/reduce)
> --------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-956
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-956
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: task
>    Affects Versions: 0.21.0
>            Reporter: Jothi Padmanabhan
>
> For the progress calculations and displaying on the UI, shuffle, in its current form,
 is decomposed into three phases (copy/sort/reduce). Actually, the sort phase is no longer
applicable. I think we should just reduce the number of phases to two and assign 50% weight-age
to each of copy and reduce phases. Thoughts?

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