java.lang.RuntimeException: java.lang.ClassNotFoundException: Class WordCount$Map not found

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    Root Cause Analysis

    1. java.lang.ClassNotFoundException

      Class WordCount$Map not found

      at org.apache.hadoop.conf.Configuration.getClassByName()
    2. Hadoop
      Configuration.getClass
      1. org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:2101)
      2. org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2193)
      2 frames
    3. Hadoop
      YarnChild$2.run
      1. org.apache.hadoop.mapreduce.task.JobContextImpl.getMapperClass(JobContextImpl.java:186)
      2. org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:745)
      3. org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
      4. org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:168)
      4 frames
    4. Java RT
      Subject.doAs
      1. java.security.AccessController.doPrivileged(Native Method)
      2. javax.security.auth.Subject.doAs(Subject.java:415)
      2 frames
    5. Hadoop
      UserGroupInformation.doAs
      1. org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
      1 frame
    6. Hadoop
      YarnChild.main
      1. org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:162)
      1 frame