Hi I know it class not found error but I have Map and reduce Class as part of Driver class So what is problem ?
I want to ask whether it is compulsory to have jar of any Hadoop Program Because it say "No job jar file set " See JobConf(Class) or JobConf#setJar(String). I am running my program using eclipse(windows machine) and Hadoop(llinux machine) remotely. On Thu, Jan 31, 2013 at 12:40 PM, Mohammad Tariq <[email protected]> wrote: > Hello Vikas, > > It clearly shows that the class can not be found. For > debugging, you can write your MR job as a standalone java program and debug > it. It works. And if you want to just debug your mapper / reducer logic, > you should look into using MRUnit. There is a good > write-up<http://blog.cloudera.com/blog/2009/07/debugging-mapreduce-programs-with-mrunit/>at > Cloudera's blog section which talks about it in detail. > > HTH > > Warm Regards, > Tariq > https://mtariq.jux.com/ > cloudfront.blogspot.com > > > On Thu, Jan 31, 2013 at 11:56 AM, Vikas Jadhav > <[email protected]>wrote: > >> 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. >> >> > > -- * * * Thanx and Regards* * Vikas Jadhav*
