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Posted to common-user@hadoop.apache.org by Arun C Murthy <ac...@hortonworks.com> on 2013/04/11 09:14:48 UTC
Re: Hadoop Map Reduce Problem - Reduce failing
Moving to user@.
What version of Hadoop are you running?
On Apr 10, 2013, at 6:57 PM, Farrokh Shahriari wrote:
> Hello,
>
> I've having a problem running my map/reduce job on my cluster. The map phase, completes successfully, but the reduce phase fails with the following error message:
>
> Error: java.lang.NullPointerException
> at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
> at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.getMapCompletionEvents(ReduceTask.java:2835)
> at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.run(ReduceTask.java:2756)
>
> I've done a lot of searching, and I've found some solutions as to not having
> any underscores in my hosts names. I changed them all, but the problem still
>
>
> hasn't resolved.
> Does anyone have any idea what the problem can be?
>
> Thanks,
> Farrokh
>
--
Arun C. Murthy
Hortonworks Inc.
http://hortonworks.com/
Re: Hadoop Map Reduce Problem - Reduce failing
Posted by Farrokh Shahriari <mo...@gmail.com>.
Tnx Clint Heath,
It is solved as Clint said.
Farrokh Shahriari
On Thu, Apr 11, 2013 at 11:44 AM, Arun C Murthy <ac...@hortonworks.com> wrote:
> Moving to user@.
>
> What version of Hadoop are you running?
>
> On Apr 10, 2013, at 6:57 PM, Farrokh Shahriari wrote:
>
> Hello,
>
> I've having a problem running my map/reduce job on my cluster. The map
> phase, completes successfully, but the reduce phase fails with the
> following error message:
>
> Error: java.lang.NullPointerException
> at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
> at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.getMapCompletionEvents(ReduceTask.java:2835)
> at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.run(ReduceTask.java:2756)
>
> I've done a lot of searching, and I've found some solutions as to not having
>
> any underscores in my hosts names. I changed them all, but the problem still
>
> hasn't resolved.
>
> Does anyone have any idea what the problem can be?
>
> Thanks,
>
> Farrokh
>
>
>
> --
> Arun C. Murthy
> Hortonworks Inc.
> http://hortonworks.com/
>
>
>
Re: Hadoop Map Reduce Problem - Reduce failing
Posted by Farrokh Shahriari <mo...@gmail.com>.
Tnx Clint Heath,
It is solved as Clint said.
Farrokh Shahriari
On Thu, Apr 11, 2013 at 11:44 AM, Arun C Murthy <ac...@hortonworks.com> wrote:
> Moving to user@.
>
> What version of Hadoop are you running?
>
> On Apr 10, 2013, at 6:57 PM, Farrokh Shahriari wrote:
>
> Hello,
>
> I've having a problem running my map/reduce job on my cluster. The map
> phase, completes successfully, but the reduce phase fails with the
> following error message:
>
> Error: java.lang.NullPointerException
> at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
> at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.getMapCompletionEvents(ReduceTask.java:2835)
> at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.run(ReduceTask.java:2756)
>
> I've done a lot of searching, and I've found some solutions as to not having
>
> any underscores in my hosts names. I changed them all, but the problem still
>
> hasn't resolved.
>
> Does anyone have any idea what the problem can be?
>
> Thanks,
>
> Farrokh
>
>
>
> --
> Arun C. Murthy
> Hortonworks Inc.
> http://hortonworks.com/
>
>
>
Re: Hadoop Map Reduce Problem - Reduce failing
Posted by Farrokh Shahriari <mo...@gmail.com>.
Tnx Clint Heath,
It is solved as Clint said.
Farrokh Shahriari
On Thu, Apr 11, 2013 at 11:44 AM, Arun C Murthy <ac...@hortonworks.com> wrote:
> Moving to user@.
>
> What version of Hadoop are you running?
>
> On Apr 10, 2013, at 6:57 PM, Farrokh Shahriari wrote:
>
> Hello,
>
> I've having a problem running my map/reduce job on my cluster. The map
> phase, completes successfully, but the reduce phase fails with the
> following error message:
>
> Error: java.lang.NullPointerException
> at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
> at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.getMapCompletionEvents(ReduceTask.java:2835)
> at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.run(ReduceTask.java:2756)
>
> I've done a lot of searching, and I've found some solutions as to not having
>
> any underscores in my hosts names. I changed them all, but the problem still
>
> hasn't resolved.
>
> Does anyone have any idea what the problem can be?
>
> Thanks,
>
> Farrokh
>
>
>
> --
> Arun C. Murthy
> Hortonworks Inc.
> http://hortonworks.com/
>
>
>
Re: Hadoop Map Reduce Problem - Reduce failing
Posted by Farrokh Shahriari <mo...@gmail.com>.
Tnx Clint Heath,
It is solved as Clint said.
Farrokh Shahriari
On Thu, Apr 11, 2013 at 11:44 AM, Arun C Murthy <ac...@hortonworks.com> wrote:
> Moving to user@.
>
> What version of Hadoop are you running?
>
> On Apr 10, 2013, at 6:57 PM, Farrokh Shahriari wrote:
>
> Hello,
>
> I've having a problem running my map/reduce job on my cluster. The map
> phase, completes successfully, but the reduce phase fails with the
> following error message:
>
> Error: java.lang.NullPointerException
> at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
> at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.getMapCompletionEvents(ReduceTask.java:2835)
> at org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.run(ReduceTask.java:2756)
>
> I've done a lot of searching, and I've found some solutions as to not having
>
> any underscores in my hosts names. I changed them all, but the problem still
>
> hasn't resolved.
>
> Does anyone have any idea what the problem can be?
>
> Thanks,
>
> Farrokh
>
>
>
> --
> Arun C. Murthy
> Hortonworks Inc.
> http://hortonworks.com/
>
>
>