code: public void logStarted() {
      if (disableHistory) {
        return;
      }
  
      if (null != writers) {
        log(writers, RecordTypes.Job,
            new Keys[] {Keys.JOBID, Keys.JOB_STATUS},
            new String[] {jobId.toString(),
                          Values.RUNNING.name()});
      }
    }
docs: Logs job as running