Do you run the map reduce job in command line or IDE? in map reduce mode,
you should put the jar containing the map and reduce class in your classpath
Jeff Zhang
On Fri, Nov 27, 2009 at 2:19 PM, <aa...@buffalo.edu> wrote:
> Hello Everybody,
> I have a doubt in Haddop and was wondering if anybody has
> faced a
> similar problem. I have a package called test. Inside that I have class
> called
> A.java, Map.java, Reduce.java. In A.java I have the main method where I am
> trying
> to initialize the jobConf object. I have written
> jobConf.setMapperClass(Map.class) and similarly for the reduce class as
> well. The
> code works correctly when I run the code locally via
> jobConf.set("mapred.job.tracker","local") but I get an exception when I try
> to
> run this code on my cluster. The stack trace of the exception is as under.
> I
> cannot understand the problem. Any help would be appreciated.
>
> java.lang.RuntimeException: java.lang.RuntimeException:
> java.lang.ClassNotFoundException: test.Map
> at
> org.apache.hadoop.conf.Configuration.getClass(Configuration.java:752)
> at org.apache.hadoop.mapred.JobConf.getMapperClass(JobConf.java:690)
> 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:83)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:338)
> at org.apache.hadoop.mapred.Child.main(Child.java:158)
> Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException:
> Markowitz.covarMatrixMap
> at
> org.apache.hadoop.conf.Configuration.getClass(Configuration.java:720)
> at
> org.apache.hadoop.conf.Configuration.getClass(Configuration.java:744)
> ... 6 more
> Caused by: java.lang.ClassNotFoundException: test.Map
> 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:276)
> 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:247)
> at
> org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:673)
> at
> org.apache.hadoop.conf.Configuration.getClass(Configuration.java:718)
> ... 7 more
>
> Thank You
>
>
> Abhishek Agrawal
>
> SUNY- Buffalo
> (716-435-7122)
>
>
>
>
