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https://issues.apache.org/jira/browse/HADOOP-2959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12576217#action_12576217
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Runping Qi commented on HADOOP-2959:
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I don't think such a feature hold much value for combiners.
And I don't think such a contract is ever documented clearly for combiners.
Do you have any use cases for that feature for the combiner?
> When a mapper needs to run a combiner, it should create one and reuse it,
> instead of creating one per partition per spill
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-2959
> URL: https://issues.apache.org/jira/browse/HADOOP-2959
> Project: Hadoop Core
> Issue Type: Bug
> Components: mapred
> Affects Versions: 0.16.0
> Reporter: Runping Qi
>
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