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Hadoop, mail # user - getting NullPointerException while running Word cont example


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Re: getting NullPointerException while running Word cont example
Sujit Dhamale 2012-03-07, 03:39
Hadoop version : hadoop-0.20.203.0rc1.tar
Operaring Syatem : ubuntu 11.10
On Wed, Mar 7, 2012 at 12:19 AM, Harsh J <[EMAIL PROTECTED]> wrote:

> Hi Sujit,
>
> Please also tell us which version/distribution of Hadoop is this?
>
> On Tue, Mar 6, 2012 at 11:27 PM, Sujit Dhamale <[EMAIL PROTECTED]>
> wrote:
> > Hi,
> >
> > I am new to Hadoop., i install Hadoop as per
> >
> http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluster/
> <
> http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluste
> >
> >
> >
> > while running Word cont example i am getting *NullPointerException
> >
> > *can some one please look in to this issue ?*
> >
> > *Thanks in Advance*  !!!
> >
> > *
> >
> >
> > duser@sujit:~/Desktop/hadoop$ bin/hadoop dfs -ls /user/hduser/data
> > Found 3 items
> > -rw-r--r--   1 hduser supergroup     674566 2012-03-06 23:04
> > /user/hduser/data/pg20417.txt
> > -rw-r--r--   1 hduser supergroup    1573150 2012-03-06 23:04
> > /user/hduser/data/pg4300.txt
> > -rw-r--r--   1 hduser supergroup    1423801 2012-03-06 23:04
> > /user/hduser/data/pg5000.txt
> >
> > hduser@sujit:~/Desktop/hadoop$ bin/hadoop jar hadoop*examples*.jar
> > wordcount /user/hduser/data /user/hduser/gutenberg-outputd
> >
> > 12/03/06 23:14:33 INFO input.FileInputFormat: Total input paths to
> process
> > : 3
> > 12/03/06 23:14:33 INFO mapred.JobClient: Running job:
> job_201203062221_0002
> > 12/03/06 23:14:34 INFO mapred.JobClient:  map 0% reduce 0%
> > 12/03/06 23:14:49 INFO mapred.JobClient:  map 66% reduce 0%
> > 12/03/06 23:14:55 INFO mapred.JobClient:  map 100% reduce 0%
> > 12/03/06 23:14:58 INFO mapred.JobClient: Task Id :
> > attempt_201203062221_0002_r_000000_0, Status : FAILED
> > Error: java.lang.NullPointerException
> >    at
> > java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
> >    at
> >
> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.getMapCompletionEvents(ReduceTask.java:2900)
> >    at
> >
> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.run(ReduceTask.java:2820)
> >
> > 12/03/06 23:15:07 INFO mapred.JobClient: Task Id :
> > attempt_201203062221_0002_r_000000_1, Status : FAILED
> > Error: java.lang.NullPointerException
> >    at
> > java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
> >    at
> >
> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.getMapCompletionEvents(ReduceTask.java:2900)
> >    at
> >
> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.run(ReduceTask.java:2820)
> >
> > 12/03/06 23:15:16 INFO mapred.JobClient: Task Id :
> > attempt_201203062221_0002_r_000000_2, Status : FAILED
> > Error: java.lang.NullPointerException
> >    at
> > java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
> >    at
> >
> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.getMapCompletionEvents(ReduceTask.java:2900)
> >    at
> >
> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.run(ReduceTask.java:2820)
> >
> > 12/03/06 23:15:31 INFO mapred.JobClient: Job complete:
> job_201203062221_0002
> > 12/03/06 23:15:31 INFO mapred.JobClient: Counters: 20
> > 12/03/06 23:15:31 INFO mapred.JobClient:   Job Counters
> > 12/03/06 23:15:31 INFO mapred.JobClient:     Launched reduce tasks=4
> > 12/03/06 23:15:31 INFO mapred.JobClient:     SLOTS_MILLIS_MAPS=22084
> > 12/03/06 23:15:31 INFO mapred.JobClient:     Total time spent by all
> > reduces waiting after reserving slots (ms)=0
> > 12/03/06 23:15:31 INFO mapred.JobClient:     Total time spent by all maps
> > waiting after reserving slots (ms)=0
> > 12/03/06 23:15:31 INFO mapred.JobClient:     Launched map tasks=3
> > 12/03/06 23:15:31 INFO mapred.JobClient:     Data-local map tasks=3
> > 12/03/06 23:15:31 INFO mapred.JobClient:     Failed reduce tasks=1
> > 12/03/06 23:15:31 INFO mapred.JobClient:     SLOTS_MILLIS_REDUCES=16799
> > 12/03/06 23:15:31 INFO mapred.JobClient:   FileSystemCounters