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Failed job - failed to launch reducer

Question asked by needhelp on May 16, 2012
Latest reply on May 16, 2012 by lohit
executing a simple wordcount mapreduce on my VMWare (single MapR installation)using dhcp (not static IP)
my hosts file:
<pre>        joe_vm.localdomain joe_vm              localhost.localdomain localhost
::1                    localhost6.localdomain6 localhost6
The error I'm getting is:
Error: java.lang.NullPointerException
at java.util.concurrent.ConcurrentHashMap.get(
at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.getMapCompletionEvents(
at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$