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https://issues.apache.org/jira/browse/HADOOP-2399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Owen O'Malley updated HADOOP-2399:
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Attachment: reuse-obj.patch
This is a rough patch that isn't quite working yet.
> Input key and value to combiner and reducer should be reused
> ------------------------------------------------------------
>
> Key: HADOOP-2399
> URL: https://issues.apache.org/jira/browse/HADOOP-2399
> Project: Hadoop
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.15.1
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Fix For: 0.16.0
>
> Attachments: reuse-obj.patch
>
>
> Currently, the input key and value are recreated on every iteration for input
> to the combiner and reducer. It would speed up the system substantially if we
> reused the keys and values. The down side of doing it, is that it may break
> applications that count on holding references to previous keys and values,
> but I think it is worth doing.
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