org.apache.hadoop.mapred.YarnChild: Exception running child : java.lang.RuntimeException:

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java.lang.ClassNotFoundException: Class org.apache.hadoop.example.QuasiMonteCarlo$QmcMapper not found
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:1801)
at org.apache.hadoop.mapreduce.task.JobContextImpl.getMapperClass(JobContextImpl.java:196)
at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:722)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:340)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548)

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