[MAPREDUCE-2341] Map and Reduce task JVMs are hanging infinitely

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: tasktracker

Environment

Linux

• Assignee: Unassigned
• Reporter: Bhallamudi Venkata Siva Kamesh
• Created: 21/Feb/11 09:36
• Updated: 21/Feb/11 09:40

Description

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
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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