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Posted to common-issues@hadoop.apache.org by "Hudson (JIRA)" <ji...@apache.org> on 2013/06/16 21:17:20 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=13684750#comment-13684750 ]
Hudson commented on HADOOP-2:
-----------------------------
Integrated in Hadoop-trunk-Commit #3938 (See [https://builds.apache.org/job/Hadoop-trunk-Commit/3938/])
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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