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Posted to dev@mahout.apache.org by "Mike Percy (JIRA)" <ji...@apache.org> on 2013/09/17 04:40:53 UTC

[jira] [Commented] (MAHOUT-1335) MultithreadedSharingMapper fails on Hadoop 2

    [ https://issues.apache.org/jira/browse/MAHOUT-1335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13769117#comment-13769117 ] 

Mike Percy commented on MAHOUT-1335:
------------------------------------

Attaching patch to address this issue.
                
> MultithreadedSharingMapper fails on Hadoop 2
> --------------------------------------------
>
>                 Key: MAHOUT-1335
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1335
>             Project: Mahout
>          Issue Type: Bug
>          Components: Collaborative Filtering
>    Affects Versions: 0.8
>            Reporter: Mike Percy
>             Fix For: 0.9
>
>         Attachments: MAHOUT-1335.patch
>
>
> Between Hadoop 1 and 2, the string value of the Configuration option that stores the mapper classname in MultithreadedMapper changed from "mapred.map.multithreadedrunner.class" to "mapreduce.mapper.multithreadedmapper.mapclass".
> Since there is a stable API (getMapperClass()) that abstracts these differences away, we should use that instead.

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