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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2959) When a mapper needs to run a combiner, it should create one and reuse it, instead of creating one per partition per spill
Date Fri, 07 Mar 2008 14:45:46 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12576217#action_12576217
] 

Runping Qi commented on HADOOP-2959:
------------------------------------


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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