Hi Avinash, Can you explain how you are running the wordcount example? Also, which version of Hadoop are you using? I would really recommend using 0.12.3.
Regards Mahadev > -----Original Message----- > From: Phantom [mailto:[EMAIL PROTECTED] > Sent: Tuesday, May 29, 2007 1:10 PM > To: [email protected] > Subject: Classpath setting problem for Map tasks > > How do I specify the classpath via the JobConf ? In my jobtracker web UI I > see a whole slew of ClassNotFoundException's for the WordCount$MapClass. > The > stack trace is pasted below. But how do I fix this - just pass the -cp > <classpath> to the mapred.child.java.opts property of the JobConf ? > exporting CLASSPATH doesn't seem to work.hh > > Thanks > Avinash > > java.lang.RuntimeException: java.lang.RuntimeException: > java.lang.ClassNotFoundException: > org.apache.hadoop.examples.WordCount$MapClass > at > org.apache.hadoop.conf.Configuration.getClass(Configuration.java:344) > at org.apache.hadoop.mapred.JobConf.getMapperClass(JobConf.java:459) > at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34) > at > org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:58) > at > org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:82 > ) > at org.apache.hadoop.mapred.MapTask.run(MapTask.java:170) > at > org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1445) > Caused by: java.lang.RuntimeException: > java.lang.ClassNotFoundException: > org.apache.hadoop.examples.WordCount$MapClass > at > org.apache.hadoop.conf.Configuration.getClass(Configuration.java:328) > at > org.apache.hadoop.conf.Configuration.getClass(Configuration.java:339) > ... 6 more > Caused by: java.lang.ClassNotFoundException: > org.apache.hadoop.examples.WordCount$MapClass > at java.net.URLClassLoader$1.run(URLClassLoader.java:200) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(URLClassLoader.java:188) > at java.lang.ClassLoader.loadClass(ClassLoader.java:306) > at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268) > at java.lang.ClassLoader.loadClass(ClassLoader.java:251) > at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) > at java.lang.Class.forName0(Native Method) > at java.lang.Class.forName(Class.java:242) > at > org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:315 > ) > at > org.apache.hadoop.conf.Configuration.getClass(Configuration.java:326) > ... 7 more > > java.lang.RuntimeException: java.lang.RuntimeException: > java.lang.ClassNotFoundException: > org.apache.hadoop.examples.WordCount$MapClass > at > org.apache.hadoop.conf.Configuration.getClass(Configuration.java:344) > at org.apache.hadoop.mapred.JobConf.getMapperClass(JobConf.java:459) > at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34) > at > org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:58) > at > org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:82 > ) > at org.apache.hadoop.mapred.MapTask.run(MapTask.java:170) > at > org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1445) > Caused by: java.lang.RuntimeException: > java.lang.ClassNotFoundException: > org.apache.hadoop.examples.WordCount$MapClass > at > org.apache.hadoop.conf.Configuration.getClass(Configuration.java:328) > at > org.apache.hadoop.conf.Configuration.getClass(Configuration.java:339) > ... 6 more > Caused by: java.lang.ClassNotFoundException: > org.apache.hadoop.examples.WordCount$MapClass > at java.net.URLClassLoader$1.run(URLClassLoader.java:200) > at java.security.AccessController.doPrivileged(Native Method) > at java.net.URLClassLoader.findClass(URLClassLoader.java:188) > at java.lang.ClassLoader.loadClass(ClassLoader.java:306) > at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268) > at java.lang.ClassLoader.loadClass(ClassLoader.java:251) > at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319) > at java.lang.Class.forName0(Native Method) > at java.lang.Class.forName(Class.java:242) > at > org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:315 > ) > at > org.apache.hadoop.conf.Configuration.getClass(Configuration.java:326) > ... 7 more
