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From vaibhav negi <sssssssena...@gmail.com>
Subject Error: java.lang.NullPointerException
Date Wed, 29 Sep 2010 12:00:49 GMT
Hi,

I am using hadoop version 0.20.2

While running query "select count(*) from table;" on Hive,i am getting this
error

FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.
exec.MapRedTask

Error in task tracker logs says :-

Error: java.lang.NullPointerException
 at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
at
org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.getMapCompletionEvents(ReduceTask.java:2683)
at
org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.run(ReduceTask.java:2605)


How to debug and correct it??


Vaibhav Negi

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