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Posted to common-issues@hadoop.apache.org by "Hudson (JIRA)" <ji...@apache.org> on 2013/07/02 17:10:22 UTC

[jira] [Commented] (HADOOP-2) Reused Keys and Values fail with a Combiner

    [ https://issues.apache.org/jira/browse/HADOOP-2?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13697863#comment-13697863 ] 

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

Integrated in Hive-trunk-h0.21 #2175 (See [https://builds.apache.org/job/Hive-trunk-h0.21/2175/])
    HIVE-4436 : hive.exec.parallel=true doesn't work on hadoop-2
 (Gopal V via Navis) (Revision 1498773)

     Result = FAILURE
                
> 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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