[ http://issues.apache.org/jira/browse/HADOOP-816?page=all ]
Devaraj Das updated HADOOP-816:
-------------------------------
Attachment: 816.patch
Added the default setting for map.buffer.size.mb in hadoop-default.xml
> 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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