Home | About | Sematext search-lucene.com search-hadoop.com
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB
 Search Hadoop and all its subprojects:

Switch to Threaded View
Hadoop >> mail # user >> getting NullPointerException while running Word cont example


Copy link to this message
-
getting NullPointerException while running Word cont example
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*  !!!

*Hadoop version : hadoop-0.20.203.0rc1.tar
Operaring Syatem : ubuntu 11.10

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$
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB