Hi Sujit, I think it is a problem with the host names configuration. Could you please check whether you added the host names of the master and the slaves in the etc/hosts file of all the nodes.
On Mon, Apr 2, 2012 at 8:00 PM, Sujit Dhamale <sujitdhamal...@gmail.com>wrote: > Can some one please look in to below issue ?? > Thanks in Advance > > On Wed, Mar 7, 2012 at 9:09 AM, Sujit Dhamale <sujitdhamal...@gmail.com > >wrote: > > > Hadoop version : hadoop-0.20.203.0rc1.tar > > Operaring Syatem : ubuntu 11.10 > > > > > > > > On Wed, Mar 7, 2012 at 12:19 AM, Harsh J <ha...@cloudera.com> 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 < > sujitdhamal...@gmail.com> > >> 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 > >> > 12/03/06 23:15:31 INFO mapred.JobClient: FILE_BYTES_READ=740520 > >> > 12/03/06 23:15:31 INFO mapred.JobClient: HDFS_BYTES_READ=3671863 > >> > 12/03/06 23:15:31 INFO mapred.JobClient: > FILE_BYTES_WRITTEN=2278287 > >> > 12/03/06 23:15:31 INFO mapred.JobClient: File Input Format Counters > >> > 12/03/06 23:15:31 INFO mapred.JobClient: Bytes Read=3671517 > >> > 12/03/06 23:15:31 INFO mapred.JobClient: Map-Reduce Framework > >> > 12/03/06 23:15:31 INFO mapred.JobClient: Map output materialized > >> > bytes=1474341 > >> > 12/03/06 23:15:31 INFO mapred.JobClient: Combine output > >> records=102322 > >> > 12/03/06 23:15:31 INFO mapred.JobClient: Map input records=77932 > >> > 12/03/06 23:15:31 INFO mapred.JobClient: Spilled Records=153640 > >> > 12/03/06 23:15:31 INFO mapred.JobClient: Map output bytes=6076095 > >> > 12/03/06 23:15:31 INFO mapred.JobClient: Combine input > >> records=629172 > >> > 12/03/06 23:15:31 INFO mapred.JobClient: Map output records=629172 > >> > 12/03/06 23:15:31 INFO mapred.JobClient: SPLIT_RAW_BYTES=346 > >> > hduser@sujit:~/Desktop/hadoop$ > >> > >> > >> > >> -- > >> Harsh J > >> > > > > >
