Hive JobHooks

ExecDriver.execute(DriverContext driverContext) {

      JobClient jc = new JobClient(job);

      // make this client wait if job trcker is not behaving well.
      Throttle.checkJobTracker(job, LOG);

      runPreJobHooks();  // Call the Pre-job hooks' list
      orig_rj = rj = jc.submitJob(job);
     
      jobInfo(rj);
      progress(th); // success status will be setup inside progress
}

ExecDriver.progress(ExecDriverTaskHandle th) {
  
    while (!rj.isComplete()) { // job是否完成
    }
  
    // Call the post job hook list
    try {
      runPostJobHooks(rj); //执行PostJobHooks
    } catch (Exception e) {
      console.printError(e.getMessage());
    }
}

在提交作业（submitJob）前执行PreJobHooks，在作业完成（无论作业是否成功执行）后执行PostJobHooks。