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Subject: Error: java.lang.NullPointerException
From: vaibhav negi <sssssssenator@gmail.com>
To: hive-user@hadoop.apache.org, general@hadoop.apache.org
Content-Type: multipart/alternative; boundary=00151758a95e6028a6049164b610

--00151758a95e6028a6049164b610
Content-Type: text/plain; charset=ISO-8859-1

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

--00151758a95e6028a6049164b610
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Hi,<br><br>I am using hadoop version 0.20.2<br><br>While running query &quo=
t;select count(*) from table;&quot; on Hive,i am getting this error<br><br>=
FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.<div =
id=3D":2kg">
exec.MapRedTask<br>
<br>Error in task tracker logs says :-<br><br>Error: java.lang.NullPointerE=
xception<br>=A0at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHash=
Map.java:768)<br>at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMap=
EventsThread.getMapCompletionEvents(ReduceTask.java:2683)<br>

at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.run(=
ReduceTask.java:2605)<br><br><br>How to debug and correct it??<br></div><br=
 clear=3D"all"><br>Vaibhav Negi<br>

--00151758a95e6028a6049164b610--