public void setUserArgs(Map<String, Object> userArgs)
    throws IOException
  {
    String jsonString = JsonBuilder.mapToJson(userArgs);
    setField("userArgs", jsonString);
  }
The user who started this job.
hcatalog/webhcat/svr/src/main/java/org/apache/hive/hcatalog/templeton/tool/JobState.java