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


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getting NullPointerException while running Word cont example
Sujit Dhamale 2012-03-06, 17:57
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$