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From vaibhav negi <sssssssena...@gmail.com>
Subject Re: Error: java.lang.NullPointerException
Date Thu, 30 Sep 2010 11:45:14 GMT
Hello,

I am stuck at it. Please help

Regards
Vaibhav Negi


On Wed, Sep 29, 2010 at 5:30 PM, vaibhav negi <sssssssenator@gmail.com>wrote:

> 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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