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From Dereje Teklu <derete...@gmail.com>
Subject cannot start tasktracker because java.lang.NullPointerException
Date Mon, 01 Sep 2014 15:03:36 GMT
I created Single node cluster using Hadoop 1.2.1 following Running Hadoop
on Ubuntu Linux(single node cluster)
<http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluster/>.However
while trying to run single node cluster I found error cannot start
tasktracker because java.lang.NullPointerException at.....which is shown on
log file.

Tasktracker log file:

2014-08-26 23:20:07,380 INFO org.apache.hadoop.mapred.TaskTracker:
STARTUP_MSG: /************************************************************
STARTUP_MSG: Starting TaskTracker
STARTUP_MSG:   host = ubuntu/127.0.1.1
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 1.2.2-SNAPSHOT
STARTUP_MSG:   build =  -r ; compiled by 'dere' on Tue Aug 12 03:45:50 PDT 2014
STARTUP_MSG:   java = 1.7.0_65
************************************************************/2014-08-26
23:20:07,773 INFO org.apache.hadoop.metrics2.impl.MetricsConfig:
loaded properties from hadoop-metrics2.properties2014-08-26
23:20:07,861 INFO
org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source
MetricsSystem,sub=Stats registered.2014-08-26 23:20:07,862 INFO
org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot
period at 10 second(s).2014-08-26 23:20:07,862 INFO
org.apache.hadoop.metrics2.impl.MetricsSystemImpl: TaskTracker metrics
system started2014-08-26 23:20:07,876 ERROR
org.apache.hadoop.mapred.TaskTracker: Can not start task tracker
because java.lang.NullPointerException
    at org.apache.hadoop.mapred.TaskTracker.<init>(TaskTracker.java:247)
    at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:3965)
2014-08-26 23:20:07,876 INFO org.apache.hadoop.mapred.TaskTracker:
SHUTDOWN_MSG: /************************************************************
SHUTDOWN_MSG: Shutting down TaskTracker at ubuntu/127.0.1.1
************************************************************/

core-site.xml
<?xml version="1.0"?> <?xml-stylesheet type="text/xsl" href=
"configuration.xsl"?> <!-- Put site-specific property overrides in this file
. --> <configuration> <property> <name>hadoop.tmp.dir</name> <value>/app/
hadoop/tmp</value> <description>A base for other temporary directories.</
description> </property> <property> <name>fs.default.name</name>
<value>hdfs
://localhost:54310</value> <description>The name of the default file system.
A URI whose scheme and authority determine the FileSystem implementation.
The uri's scheme determines the config property (fs.SCHEME.impl) naming the
FileSystem implementation class. The uri's authority is used to determine
the host, port, etc. for a filesystem.</description> </property> </
configuration>

hdfs-site.xml
<?xml version="1.0"?> <?xml-stylesheet type="text/xsl" href=
"configuration.xsl"?> <!-- Put site-specific property overrides in this file
. --> <configuration> <property> <name>dfs.replication</name> <value>1</
value> <description>Default block replication. The actual number of
replications can be specified when the file is created. The default is used
if replication is not specified in create time. </description> </property>
</configuration>

mapred-site.xml
<?xml version="1.0"?> <?xml-stylesheet type="text/xsl" href=
"configuration.xsl"?> <!-- Put site-specific property overrides in this file
. --> <configuration> <property> <name>mapred.job.tracker</name>
<value>
localhost:54311</value> <description>The host and port that the MapReduce
job tracker runs at. If "local", then jobs are run in-process as a single
map and reduce task. </description> </property> </configuration>

jps output
dere@ubuntu:~/Desktop/hadoop-1.2.1/bin$ jps
3165 JobTracker
3370 Jps
3086 SecondaryNameNode
2766 NameNode
2911 DataNode

What would be the solution for this problem? Please help me in finding
the solution for this problem.

I tried all possible methods to solve this, but not successful. Any
pointers will help me.

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