public List<HadoopException> getChildExceptions() {
    return _childExceptions;
  }
FLOW: HadoopException object for Azkaban flow
SCHEDULER : HadoopException object for Azkaban job with Azkaban level failure
SCRIPT : HadoopException object for Azkaban job with Script level failure
MR: HadoopException object for Azkaban job with MR level failure
KILL: HadoopException object for killed Azkaban job
MRJOB: HadoopException object for MR Job
MRTASK: HadoopException object for MR Task
app/com/linkedin/drelephant/exceptions/HadoopException.java