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https://issues.apache.org/jira/browse/MAPREDUCE-3115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13116491#comment-13116491
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Bhallamudi Venkata Siva Kamesh commented on MAPREDUCE-3115:
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When we set instace of MultithreadedMapper using
job.getConfiguration().setClass("mapred.map.multithreadedrunner.class",
MultithreadedMapper.class, Mapper.class), the same class acts as mapClass. so
it calls recursively itself, till OOM occures.
> 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
> Environment: NA
> Reporter: Bhallamudi Venkata Siva Kamesh
>
> 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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