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From "Bhallamudi Venkata Siva Kamesh (JIRA)" <j...@apache.org>
Subject [jira] Created: (MAPREDUCE-2341) Map and Reduce task JVMs are hanging infinitely
Date Mon, 21 Feb 2011 09:37:42 GMT
Map and Reduce task JVMs are hanging infinitely 
------------------------------------------------

                 Key: MAPREDUCE-2341
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2341
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: tasktracker
         Environment: Linux
            Reporter: Bhallamudi Venkata Siva Kamesh
            Priority: Critical


Description:
 When launching Mapreduce application, the property *mapred.job.reuse.jvm.num.tasks* has been
set to *0*, as a result the task JVM(MAP or Reduce JVM) is hanging indefinitely and finally
being killed by Tasktracker.

Steps to Reproduce
------------------
1) Set the *mapred.job.reuse.jvm.num.tasks* property in mapred-site.xml to 0
2) Execute the wordcount example, child JVM is hanging indefinitely and finally killed by
Tasktracker


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