@RestrictedApi(explanation = "Only visible for testing", link = "",
      allowedOnPath = ".*/src/test/.*")
  Job getMapReduceJob() {
    return job;
  }
Main entry point.
@param args The command line parameters.
@throws Exception When running the job fails.
hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/RowCounter.java