[jira] [Commented] (MAPREDUCE-3115) OOM When the value for the property "mapred.map.multithreadedrunner.class" is set to MultithreadedMapper instance.

["Mostafa Elhemali (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13508367#comment-13508367 ] 

Mostafa Elhemali commented on MAPREDUCE-3115:
---------------------------------------------

Good find! I've taken the liberty of updating the patch to work against trunk.

Not sure if I'm allowed to +1 when I've uploaded my own patch, but +1 from me.
                
> OOM When the value for the property "mapred.map.multithreadedrunner.class" is set to MultithreadedMapper instance.
> ------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3115
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3115
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv1
>    Affects Versions: 0.23.0, 1.0.0
>         Environment: NA
>            Reporter: Bhallamudi Venkata Siva Kamesh
>         Attachments: MAPREDUCE-3115.2.patch, MAPREDUCE-3115.patch
>
>
> When we set the value for the property *mapred.map.multithreadedrunner.class* as instance of MultithreadedMapper, using MultithreadedMapper.setMapperClass(), it simply throws IllegalArgumentException.
> But when we set the same property, using job's conf object using job.getConfiguration().setClass(*mapred.map.multithreadedrunner.class*, MultithreadedMapper.class, Mapper.class), throws OOM.

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