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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-816) Allow the sort benchmark to set a buffersize for the map buffer
Date Tue, 12 Dec 2006 11:08:22 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-816?page=all ]

Devaraj Das updated HADOOP-816:
-------------------------------

    Status: Patch Available  (was: Open)

> Allow the sort benchmark to set a buffersize for the map buffer
> ---------------------------------------------------------------
>
>                 Key: HADOOP-816
>                 URL: http://issues.apache.org/jira/browse/HADOOP-816
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Devaraj Das
>         Assigned To: Devaraj Das
>         Attachments: 816.patch
>
>
> Discovered that framework merges are the hotspots where most time is spent in the sort
benchmark. With HADOOP-331, the Map phase could potentially do a merge of the spills (this
merge was not done pre-HADOOP-331), and then there is one compulsory merge on each reduce.
It may be good to avoid the merge in the Map phase, if possible.

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