Package org.apache.hadoop.mapred.FakeObjectUtilities

Examples of org.apache.hadoop.mapred.FakeObjectUtilities.FakeJobInProgress.findMapTask()

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    conf.setFloat(JobInProgress.SPECULATIVE_SLOWTASK_THRESHOLD, 0.5f);
    FakeJobInProgress job = new FakeJobInProgress(conf, jobTracker);
    job.initTasks();

    taskAttemptID[0] = job.findMapTask(trackers[0]);
    taskAttemptID[1] = job.findMapTask(trackers[1]);
    taskAttemptID[2] = job.findMapTask(trackers[2]);
    taskAttemptID[3] = job.findMapTask(trackers[3]);
    clock.advance(2000);
    job.finishTask(taskAttemptID[0]);
    job.finishTask(taskAttemptID[1]);
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    FakeJobInProgress job = new FakeJobInProgress(conf, jobTracker);
    job.initTasks();

    taskAttemptID[0] = job.findMapTask(trackers[0]);
    taskAttemptID[1] = job.findMapTask(trackers[1]);
    taskAttemptID[2] = job.findMapTask(trackers[2]);
    taskAttemptID[3] = job.findMapTask(trackers[3]);
    clock.advance(2000);
    job.finishTask(taskAttemptID[0]);
    job.finishTask(taskAttemptID[1]);
    job.finishTask(taskAttemptID[2]);
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    job.initTasks();

    taskAttemptID[0] = job.findMapTask(trackers[0]);
    taskAttemptID[1] = job.findMapTask(trackers[1]);
    taskAttemptID[2] = job.findMapTask(trackers[2]);
    taskAttemptID[3] = job.findMapTask(trackers[3]);
    clock.advance(2000);
    job.finishTask(taskAttemptID[0]);
    job.finishTask(taskAttemptID[1]);
    job.finishTask(taskAttemptID[2]);
    clock.advance(250000);
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    clock.advance(2000);
    job.finishTask(taskAttemptID[0]);
    job.finishTask(taskAttemptID[1]);
    job.finishTask(taskAttemptID[2]);
    clock.advance(250000);
    taskAttemptID[4] = job.findMapTask(trackers[3]);
    clock.advanceBySpeculativeLag();
    //by doing the above clock adjustments, we bring the progress rate of
    //taskID 3 lower than 4. For taskID 3, the rate is 85/317000
    //and for taskID 4, the rate is 20/65000. But when we ask for a spec task
    //now, we should get back taskID 4 (since that is expected to complete
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    //now, we should get back taskID 4 (since that is expected to complete
    //later than taskID 3).
    job.refresh(clock.getTime());
    job.progressMade(taskAttemptID[3], 0.85f);
    job.progressMade(taskAttemptID[4], 0.20f);
    taskAttemptID[5] = job.findMapTask(trackers[4]);
    assertEquals(taskAttemptID[5].getTaskID().getId(),4);
  }

  /*
   * Tests the fact that we should not choose tasks
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    conf.setMapSpeculativeDuration(300L);
    FakeJobInProgress job = new FakeJobInProgress(conf, jobTracker);
    job.initTasks();

    // a really fast task #1
    taskAttemptID[0] = job.findMapTask(trackers[0]);
    clock.advance(2000);
    job.finishTask(taskAttemptID[0]);

    // task #2 is slow
    taskAttemptID[1] = job.findMapTask(trackers[1]);
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    taskAttemptID[0] = job.findMapTask(trackers[0]);
    clock.advance(2000);
    job.finishTask(taskAttemptID[0]);

    // task #2 is slow
    taskAttemptID[1] = job.findMapTask(trackers[1]);
    clock.advanceBySpeculativeLag();
    clock.advance(5000);
    // 65 secs have elapsed since task scheduling
    // set progress so that it will complete within
    // 300 seconds
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    // 300 seconds
    job.progressMade(taskAttemptID[1], 0.7f);

    // no new map task should be found
    job.refresh(clock.getTime());
    assertEquals(job.findMapTask(trackers[2]), null);
  }

  /*
   * Tests the fact that we only launch a limited number of speculative tasks,
   * even though we have a lot of tasks in RUNNING state
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    jobTracker.setNumSlots(slots);
    FakeJobInProgress job = new FakeJobInProgress(conf, jobTracker);
    job.initTasks();
    int i;
    for (i = 0; i < totalTasks; i++) {
      taskAttemptID[i] = job.findMapTask(trackers[0]);
    }
    clock.advance(5000);
    for (i = 0; i < numEarlyComplete; i++) {
      job.finishTask(taskAttemptID[i]);
    }
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      job.progressMade(taskAttemptID[i], 0.85f);
    }
    clock.advance(50000);
    for (i = 0; i < (totalTasks - numEarlyComplete); i++) {
      job.refresh(clock.getTime());
      taskAttemptID[i] = job.findMapTask(trackers[1]);
      clock.advance(2000);
      if (taskAttemptID[i] != null) {
        //add some good progress constantly for the different
        //task-attempts so that
        //the tasktracker doesn't get into the slow trackers category
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