You are viewing a plain text version of this content. The canonical link for it is here.
Posted to general@hadoop.apache.org by vaibhav negi <ss...@gmail.com> on 2010/09/29 14:00:49 UTC

Error: java.lang.NullPointerException

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

Re: Error: java.lang.NullPointerException

Posted by vaibhav negi <ss...@gmail.com>.
Hello,

I am stuck at it. Please help

Regards
Vaibhav Negi


On Wed, Sep 29, 2010 at 5:30 PM, vaibhav negi <ss...@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
>

Re: Error: java.lang.NullPointerException

Posted by vaibhav negi <ss...@gmail.com>.
Hello,

I am stuck at it. Please help

Regards
Vaibhav Negi


On Wed, Sep 29, 2010 at 5:30 PM, vaibhav negi <ss...@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
>

Re: Error: java.lang.NullPointerException

Posted by vaibhav negi <ss...@gmail.com>.
Hello,

I am stuck at it. Please help

Regards
Vaibhav Negi


On Wed, Sep 29, 2010 at 5:30 PM, vaibhav negi <ss...@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
>