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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-2) Reused Keys and Values fail with a Combiner
Date Mon, 17 Jun 2013 14:09:32 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13685588#comment-13685588
] 

Hudson commented on HADOOP-2:
-----------------------------

Integrated in Hadoop-Mapreduce-trunk #1460 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1460/])
    MAPREDUCE-5184. Document compatibility for MapReduce applications in hadoop-2 vis-a-vis
hadoop-1. Contributed by Zhijie Shen. (Revision 1493570)

     Result = SUCCESS
                
> Reused Keys and Values fail with a Combiner
> -------------------------------------------
>
>                 Key: HADOOP-2
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>             Fix For: 0.1.0
>
>         Attachments: clone-map-output.patch
>
>
> If the map function reuses the key or value by destructively modifying it after the output.collect(key,value)
call and your application uses a combiner, the data is corrupted by having lots of instances
with the last key or value.

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