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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2410) document multiple keys per reducer oddity in hadoop streaming FAQ
Date Thu, 12 May 2011 13:17:47 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032394#comment-13032394
] 

Hudson commented on MAPREDUCE-2410:
-----------------------------------

Integrated in Hadoop-Mapreduce-22-branch #48 (See [https://builds.apache.org/hudson/job/Hadoop-Mapreduce-22-branch/48/])
    MAPREDUCE-2410. Add entry to streaming FAQ about how streaming reducers receive keys.
Contributed by Harsh J Chouraria.


> document multiple keys per reducer oddity in hadoop streaming FAQ
> -----------------------------------------------------------------
>
>                 Key: MAPREDUCE-2410
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2410
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: contrib/streaming, documentation
>    Affects Versions: 0.20.2
>            Reporter: Dieter Plaetinck
>            Assignee: Harsh J Chouraria
>            Priority: Minor
>              Labels: newbie
>             Fix For: 0.22.0
>
>         Attachments: MAPREDUCE-2410.r1.diff, MAPREDUCE-2410.r2.diff, MAPREDUCE-2410.r3.diff
>
>   Original Estimate: 40m
>  Remaining Estimate: 40m
>
> Hi,
> for a newcomer to hadoop streaming, it comes as a surprise that the reducer receives
arbitrary keys, unlike the "real" hadoop where a reducer works on a single key.
> An explanation for this is @ http://mail-archives.apache.org/mod_mbox/hadoop-common-user/201103.mbox/browser
> I suggest to add this to the FAQ of hadoop streaming

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