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Posted to mapreduce-dev@hadoop.apache.org by "Devaraj Das (JIRA)" <ji...@apache.org> on 2009/07/30 14:55:15 UTC
[jira] Resolved: (MAPREDUCE-796) Encountered "ClassCastException"
on tasktracker while running wordcount with MultithreadedMapRunner
[ https://issues.apache.org/jira/browse/MAPREDUCE-796?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Devaraj Das resolved MAPREDUCE-796.
-----------------------------------
Resolution: Won't Fix
Looks like this is a problem caused by a combination of MultiThreadedMapRunner and enabling Native Compression.
> Encountered "ClassCastException" on tasktracker while running wordcount with MultithreadedMapRunner
> ---------------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-796
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-796
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: examples
> Affects Versions: 0.20.1
> Reporter: Suman Sehgal
>
> ClassCastException for OutOfMemoryError is encountered on tasktracker while running wordcount example with MultithreadedMapRunner.
> Stack trace :
> =========
> java.lang.ClassCastException: java.lang.OutOfMemoryError cannot be cast to java.lang.RuntimeException
> at org.apache.hadoop.mapreduce.lib.map.MultithreadedMapper.run(MultithreadedMapper.java:149)
> at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:581)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:303)
> at org.apache.hadoop.mapred.Child.main(Child.java:170)
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