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https://issues.apache.org/jira/browse/HADOOP-1965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12535529
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Runping Qi commented on HADOOP-1965:
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It seems clear that threaded spill performed much better than sequence spill.
One thing surprising is that the spill times got worse as sort.io.mb increaseed.
This sounds counterintuitive. Any insights/explanations?
> Handle map output buffers better
> --------------------------------
>
> Key: HADOOP-1965
> URL: https://issues.apache.org/jira/browse/HADOOP-1965
> Project: Hadoop
> Issue Type: Improvement
> Components: mapred
> Reporter: Devaraj Das
> Assignee: Amar Kamat
> Attachments: 1965_single_proc_150mb_gziped.pdf
>
>
> 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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