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https://issues.apache.org/jira/browse/HADOOP-1965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12540242
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Doug Cutting commented on HADOOP-1965:
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> Doug, regarding your comment on pushing the sorting to the maps is not clear
> to me.
Sorry, I was a confused. I forgot that spills were now fully merged prior to
shuffle, and rather thought that spills were merged at reduce.
> Handle map output buffers better
> --------------------------------
>
> Key: HADOOP-1965
> URL: https://issues.apache.org/jira/browse/HADOOP-1965
> Project: Hadoop
> Issue Type: Improvement
> Components: mapred
> Affects Versions: 0.16.0
> Reporter: Devaraj Das
> Assignee: Amar Kamat
> Fix For: 0.16.0
>
> Attachments: 1965_single_proc_150mb_gziped.jpeg,
> 1965_single_proc_150mb_gziped.pdf, 1965_single_proc_150mb_gziped_breakup.png,
> HADOOP-1965-1.patch
>
>
> Today, the map task stops calling the map method while sort/spill is using
> the (single instance of) map output buffer. One improvement that can be done
> to improve performance of the map task is to have another buffer for writing
> the map outputs to, while sort/spill is using the first buffer.
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