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Posted to general@hadoop.apache.org by vaibhav negi <ss...@gmail.com> on 2010/09/28 16:37:31 UTC
Hive Error: while executing select count(*)
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)
On debugging i found that ReduceTask.java:2683 line is using host which is
coming null
ReduceTask.java:2683 ---
List loc = mapLocations.get(host);
One user in Hadoop Forum says HADOOP-4744 should be included in hadoop. Is
this patch required for hadoop 0.20.2 ?
How to add patch?
Is this an issue with /etc/hosts file?
Please help
Regards
Vaibhav Negi
Re: Hive Error: while executing select count(*)
Posted by vaibhav negi <ss...@gmail.com>.
Hi ,
please suggest remedy for this.
Vaibhav Negi
On Tue, Sep 28, 2010 at 8:33 PM, vaibhav negi <ss...@gmail.com>wrote:
>
> Hi Guru,
>
> Still same error. This problem is with host name resolution according to
> log.
>
>
> Vaibhav Negi
>
>
>
> On Tue, Sep 28, 2010 at 8:16 PM, Guru Prasad <gu...@ibibogroup.com>wrote:
>
>>
>> Try running
>> "select count(1) from table;"
>>
>> Thanks & Regards
>> ~guru
>>
>> On 09/28/2010 08:07 PM, vaibhav negi 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)
>>>
>>> On debugging i found that ReduceTask.java:2683 line is using host which
>>> is coming null
>>>
>>> ReduceTask.java:2683 ---
>>> List loc = mapLocations.get(host);
>>>
>>> One user in Hadoop Forum says HADOOP-4744 should be included in hadoop.
>>> Is this patch required for hadoop 0.20.2 ?
>>> How to add patch?
>>>
>>> Is this an issue with /etc/hosts file?
>>>
>>> Please help
>>>
>>> Regards
>>> Vaibhav Negi
>>>
>>
>> This message is intended only for the use of the addressee and may contain
>> information that is privileged, confidential and exempt from disclosure
>> under applicable law. If the reader of this message is not the intended
>> recipient, or the employee or agent responsible for delivering the message
>> to the intended recipient, you are hereby notified that any dissemination,
>> distribution or copying of this communication is strictly prohibited. If you
>> have received this e-mail in error, please notify us immediately by return
>> e-mail and delete this e-mail and all attachments from your system.
>>
>>
>
Re: Hive Error: while executing select count(*)
Posted by vaibhav negi <ss...@gmail.com>.
Hi Guru,
Still same error. This problem is with host name resolution according to
log.
Vaibhav Negi
On Tue, Sep 28, 2010 at 8:16 PM, Guru Prasad <gu...@ibibogroup.com>wrote:
>
> Try running
> "select count(1) from table;"
>
> Thanks & Regards
> ~guru
>
> On 09/28/2010 08:07 PM, vaibhav negi 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)
>>
>> On debugging i found that ReduceTask.java:2683 line is using host which
>> is coming null
>>
>> ReduceTask.java:2683 ---
>> List loc = mapLocations.get(host);
>>
>> One user in Hadoop Forum says HADOOP-4744 should be included in hadoop. Is
>> this patch required for hadoop 0.20.2 ?
>> How to add patch?
>>
>> Is this an issue with /etc/hosts file?
>>
>> Please help
>>
>> Regards
>> Vaibhav Negi
>>
>
> This message is intended only for the use of the addressee and may contain
> information that is privileged, confidential and exempt from disclosure
> under applicable law. If the reader of this message is not the intended
> recipient, or the employee or agent responsible for delivering the message
> to the intended recipient, you are hereby notified that any dissemination,
> distribution or copying of this communication is strictly prohibited. If you
> have received this e-mail in error, please notify us immediately by return
> e-mail and delete this e-mail and all attachments from your system.
>
>
Re: Hive Error: while executing select count(*)
Posted by Guru Prasad <gu...@ibibogroup.com>.
Try running
"select count(1) from table;"
Thanks & Regards
~guru
On 09/28/2010 08:07 PM, vaibhav negi 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)
>
> On debugging i found that ReduceTask.java:2683 line is using host
> which is coming null
>
> ReduceTask.java:2683 ---
> List loc = mapLocations.get(host);
>
> One user in Hadoop Forum says HADOOP-4744 should be included in
> hadoop. Is this patch required for hadoop 0.20.2 ?
> How to add patch?
>
> Is this an issue with /etc/hosts file?
>
> Please help
>
> Regards
> Vaibhav Negi
This message is intended only for the use of the addressee and may contain information that is privileged, confidential
and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, or the
employee or agent responsible for delivering the message to the intended recipient, you are hereby notified that any
dissemination, distribution or copying of this communication is strictly prohibited. If you have received this e-mail
in error, please notify us immediately by return e-mail and delete this e-mail and all attachments from your system.