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https://issues.apache.org/jira/browse/HADOOP-2399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
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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