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Issue with running hadoop program using eclipse
Vikas Jadhav 2013-01-31, 06:26
Hi
I have one windows machine and one linux machine
my eclipse is on winowds machine
and hadoop running on single linux machine
I am trying to run wordcount program from eclipse(on windows machine) to
Hadoop(on linux machine)
I getting following error

 3/01/31 11:48:14 WARN mapred.JobClient: Use GenericOptionsParser for
parsing the arguments. Applications should implement Tool for the same.
13/01/31 11:48:15 WARN mapred.JobClient: No job jar file set.  User classes
may not be found. See JobConf(Class) or JobConf#setJar(String).
13/01/31 11:48:16 INFO input.FileInputFormat: Total input paths to process
: 1
13/01/31 11:48:16 WARN util.NativeCodeLoader: Unable to load native-hadoop
library for your platform... using builtin-java classes where applicable
13/01/31 11:48:16 WARN snappy.LoadSnappy: Snappy native library not loaded
13/01/31 11:48:26 INFO mapred.JobClient: Running job: job_201301300613_0029
13/01/31 11:48:27 INFO mapred.JobClient:  map 0% reduce 0%
13/01/31 11:48:40 INFO mapred.JobClient: Task Id :
attempt_201301300613_0029_m_000000_0, Status : FAILED
java.lang.RuntimeException: java.lang.ClassNotFoundException:
WordCount$MapClass
 at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:867)
 at
org.apache.hadoop.mapreduce.JobContext.getMapperClass(JobContext.java:199)
 at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:719)
 at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
 at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
 at java.security.AccessController.doPrivileged(Native Method)
 at javax.security.auth.Subject.doAs(Subject.java:396)
 at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
 at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: java.lang.ClassNotFoundException: WordCount$MapClass
 at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
 at java.lang.Class.forName0(Native Method)
 at java.lang.Class.forName(Class.java:247)
 at
org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:820)
 at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:865)
 ... 8 more
Also I want to know how to debug Hadoop Program using eclipse.
Thank You.