Examples of org.apache.hadoop.mapreduce.ClusterMetrics

org.apache.hadoop.mapreduce.ClusterMetrics
Status information on the current state of the Map-Reduce cluster.
ClusterMetrics provides clients with information such as:
1. Size of the cluster.
2. Number of blacklisted and decommissioned trackers.
3. Slot capacity of the cluster.
4. The number of currently occupied/reserved map & reduce slots.
5. The number of currently running map & reduce tasks.
6. The number of job submissions.

    private Machine chooseMachine(Configuration conf) throws IOException {
      final int parts = conf.getInt(N_PARTS, Integer.MAX_VALUE);
      try {
        for(;; Thread.sleep(2000)) {
          //get cluster status
          final ClusterMetrics status = cluster.getClusterStatus();
          final int m = 
            status.getMapSlotCapacity() - status.getOccupiedMapSlots();
          final int r = 
            status.getReduceSlotCapacity() - status.getOccupiedReduceSlots();
          if (m >= parts || r >= parts) {
            //favor ReduceSide machine
            final Machine value = r >= parts?
                ReduceSide.INSTANCE: MapSide.INSTANCE;
            Util.out.println("  " + this + " is " + value + " (m=" + m + ", r=" + r + ")");

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    // create TaskTrackerStatus and send heartbeats
    sendHeartbeats(list);
    
    // assert ClusterMetrics
    ClusterMetrics metrics = cluster.getClusterStatus();
    assertEquals("occupied map slots do not match", mapSlotsPerTask,
      metrics.getOccupiedMapSlots());
    assertEquals("occupied reduce slots do not match", reduceSlotsPerTask,
      metrics.getOccupiedReduceSlots());
    assertEquals("map slot capacities do not match",
      mapSlotsPerTracker * trackers.length,
      metrics.getMapSlotCapacity());
    assertEquals("reduce slot capacities do not match",
      reduceSlotsPerTracker * trackers.length,
      metrics.getReduceSlotCapacity());
    assertEquals("running map tasks do not match", 1,
      metrics.getRunningMaps());
    assertEquals("running reduce tasks do not match", 1,
      metrics.getRunningReduces());
    
    // assert the values in ClusterStatus also
    assertEquals("running map tasks do not match", 1,
      jobTracker.getClusterStatus().getMapTasks());
    assertEquals("running reduce tasks do not match", 1,
      jobTracker.getClusterStatus().getReduceTasks());
    assertEquals("map slot capacities do not match",
      mapSlotsPerTracker * trackers.length,
      jobTracker.getClusterStatus().getMaxMapTasks());
    assertEquals("reduce slot capacities do not match",
      reduceSlotsPerTracker * trackers.length,
      jobTracker.getClusterStatus().getMaxReduceTasks());
    
    // send a heartbeat finishing only a map and check
    // counts are updated.
    list.clear();
    addMapTaskAttemptToList(list, mapSlotsPerTask, TaskStatus.State.SUCCEEDED);
    addReduceTaskAttemptToList(list, 
        reduceSlotsPerTask, TaskStatus.State.RUNNING);
    sendHeartbeats(list);
    metrics = jobTracker.getClusterMetrics();
    assertEquals(0, metrics.getOccupiedMapSlots());
    assertEquals(reduceSlotsPerTask, metrics.getOccupiedReduceSlots());
    
    // send a heartbeat finishing the reduce task also.
    list.clear();
    addReduceTaskAttemptToList(list, 
        reduceSlotsPerTask, TaskStatus.State.SUCCEEDED);
    sendHeartbeats(list);
    metrics = jobTracker.getClusterMetrics();
    assertEquals(0, metrics.getOccupiedReduceSlots());
  }

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    FakeObjectUtilities.sendHeartBeat(jobTracker, status1, false,
      true, trackers[0], responseId);
    FakeObjectUtilities.sendHeartBeat(jobTracker, status2, false,
      true, trackers[1], responseId);
    responseId++; 
    ClusterMetrics metrics = cluster.getClusterStatus();
    assertEquals("reserved map slots do not match", 
      2, metrics.getReservedMapSlots());
    assertEquals("reserved reduce slots do not match", 
      2, metrics.getReservedReduceSlots());


    // redo to test re-reservations.
    FakeObjectUtilities.sendHeartBeat(jobTracker, status1, false,
        true, trackers[0], responseId);
    FakeObjectUtilities.sendHeartBeat(jobTracker, status2, false,
        true, trackers[1], responseId);
    responseId++; 
    metrics = cluster.getClusterStatus();
    assertEquals("reserved map slots do not match", 
        4, metrics.getReservedMapSlots());
    assertEquals("reserved reduce slots do not match", 
        4, metrics.getReservedReduceSlots());


    TaskAttemptID mTid = fakeJob.findMapTask(trackers[1]);
    TaskAttemptID rTid = fakeJob.findReduceTask(trackers[1]);


    fakeJob.finishTask(mTid);
    fakeJob.finishTask(rTid);
    
    assertEquals("Job didnt complete successfully complete", 
      fakeJob.getStatus().getRunState(), JobStatus.SUCCEEDED);
    metrics = cluster.getClusterStatus();
    assertEquals("reserved map slots do not match", 
      0, metrics.getReservedMapSlots());
    assertEquals("reserved reduce slots do not match", 
      0, metrics.getReservedReduceSlots());
  }

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      }
    }
  }
  
  public synchronized ClusterMetrics getClusterMetrics() {
    return new ClusterMetrics(totalMaps,
      totalReduces, occupiedMapSlots, occupiedReduceSlots,
      reservedMapSlots, reservedReduceSlots,
      totalMapTaskCapacity, totalReduceTaskCapacity,
      totalSubmissions,
      taskTrackers.size() - getBlacklistedTrackerCount(),

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    // create TaskTrackerStatus and send heartbeats
    sendHeartbeats(list);


    // assert ClusterMetrics
    ClusterMetrics metrics = jobTracker.getClusterMetrics();
    assertEquals("occupied map slots do not match", mapSlotsPerTask,
      metrics.getOccupiedMapSlots());
    assertEquals("occupied reduce slots do not match", reduceSlotsPerTask,
      metrics.getOccupiedReduceSlots());
    assertEquals("map slot capacities do not match",
      mapSlotsPerTracker * trackers.length,
      metrics.getMapSlotCapacity());
    assertEquals("reduce slot capacities do not match",
      reduceSlotsPerTracker * trackers.length,
      metrics.getReduceSlotCapacity());
    assertEquals("running map tasks do not match", 1,
      metrics.getRunningMaps());
    assertEquals("running reduce tasks do not match", 1,
      metrics.getRunningReduces());
    
    // assert the values in ClusterStatus also
    ClusterStatus stat = client.getClusterStatus();
    assertEquals("running map tasks do not match", 1,
      stat.getMapTasks());
    assertEquals("running reduce tasks do not match", 1,
      stat.getReduceTasks());
    assertEquals("map slot capacities do not match",
      mapSlotsPerTracker * trackers.length,
      stat.getMaxMapTasks());
    assertEquals("reduce slot capacities do not match",
      reduceSlotsPerTracker * trackers.length,
      stat.getMaxReduceTasks());
    
    // send a heartbeat finishing only a map and check
    // counts are updated.
    list.clear();
    addMapTaskAttemptToList(list, mapSlotsPerTask, TaskStatus.State.SUCCEEDED);
    addReduceTaskAttemptToList(list, 
        reduceSlotsPerTask, TaskStatus.State.RUNNING);
    sendHeartbeats(list);
    metrics = jobTracker.getClusterMetrics();
    assertEquals(0, metrics.getOccupiedMapSlots());
    assertEquals(reduceSlotsPerTask, metrics.getOccupiedReduceSlots());
    
    // send a heartbeat finishing the reduce task also.
    list.clear();
    addReduceTaskAttemptToList(list, 
        reduceSlotsPerTask, TaskStatus.State.SUCCEEDED);
    sendHeartbeats(list);
    metrics = jobTracker.getClusterMetrics();
    assertEquals(0, metrics.getOccupiedReduceSlots());
  }

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                    jobTracker);
    
    sendHeartBeat(jobTracker, status1, false, true, trackers[0], responseId);
    sendHeartBeat(jobTracker, status2, false, true, trackers[1], responseId);
    responseId++; 
    ClusterMetrics metrics = jobTracker.getClusterMetrics();
    assertEquals("reserved map slots do not match", 
      2, metrics.getReservedMapSlots());
    assertEquals("reserved reduce slots do not match", 
      2, metrics.getReservedReduceSlots());


    // redo to test re-reservations.
    sendHeartBeat(jobTracker, status1, false, true, trackers[0], responseId);
    sendHeartBeat(jobTracker, status2, false, true, trackers[1], responseId);
    responseId++; 
    metrics = jobTracker.getClusterMetrics();
    assertEquals("reserved map slots do not match", 
        4, metrics.getReservedMapSlots());
    assertEquals("reserved reduce slots do not match", 
        4, metrics.getReservedReduceSlots());


    // undo reservations now.
    scheduler.setUnreserveSlots(true);
    sendHeartBeat(jobTracker, status1, false, true, trackers[0], responseId);
    sendHeartBeat(jobTracker, status2, false, true, trackers[1], responseId);
    responseId++;
    metrics = jobTracker.getClusterMetrics();
    assertEquals("map slots should have been unreserved",
        0, metrics.getReservedMapSlots());
    assertEquals("reduce slots should have been unreserved",
        0, metrics.getReservedReduceSlots());
  }

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      }
    }
  }


  public synchronized ClusterMetrics getClusterMetrics() {
    return new ClusterMetrics(totalMaps,
      totalReduces, occupiedMapSlots, occupiedReduceSlots,
      reservedMapSlots, reservedReduceSlots,
      totalMapTaskCapacity, totalReduceTaskCapacity,
      totalSubmissions,
      taskTrackers.size() - getBlacklistedTrackerCount(),

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  public String getSummaryJson() {
    return getSummary().toJson();
  }


  InfoMap getSummary() {
    final ClusterMetrics metrics = getClusterMetrics();
    InfoMap map = new InfoMap();
    map.put("nodes", metrics.getTaskTrackerCount()
            + getBlacklistedTrackerCount());
    map.put("alive", metrics.getTaskTrackerCount());
    map.put("blacklisted", getBlacklistedTrackerCount());
    map.put("graylisted", getGraylistedTrackerCount());
    map.put("slots", new InfoMap() {{
      put("map_slots", metrics.getMapSlotCapacity());
      put("map_slots_used", metrics.getOccupiedMapSlots());
      put("reduce_slots", metrics.getReduceSlotCapacity());
      put("reduce_slots_used", metrics.getOccupiedReduceSlots());
    }});
    map.put("jobs", metrics.getTotalJobSubmissions());
    return map;
  }

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   *         of {@link ClusterStatus}.
   * @throws IOException
   */
  public ClusterStatus getClusterStatus(boolean detailed) throws IOException {
    try {
      ClusterMetrics metrics = cluster.getClusterStatus();
      return new ClusterStatus(arrayToStringList(cluster.getActiveTaskTrackers()),
        arrayToBlackListInfo(cluster.getBlackListedTaskTrackers()),
        cluster.getTaskTrackerExpiryInterval(), metrics.getOccupiedMapSlots(),
        metrics.getOccupiedReduceSlots(), metrics.getMapSlotCapacity(),
        metrics.getReduceSlotCapacity(), 
        cluster.getJobTrackerStatus());
    } catch (InterruptedException ie) {
      throw new IOException(ie);
    }
  }

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   *         of {@link ClusterStatus}.
   * @throws IOException
   */
  public ClusterStatus getClusterStatus() throws IOException {
    try {
      ClusterMetrics metrics = cluster.getClusterStatus();
      return new ClusterStatus(metrics.getTaskTrackerCount(),
        metrics.getBlackListedTaskTrackerCount(), cluster.getTaskTrackerExpiryInterval(),
        metrics.getOccupiedMapSlots(),
        metrics.getOccupiedReduceSlots(), metrics.getMapSlotCapacity(),
        metrics.getReduceSlotCapacity(),
        cluster.getJobTrackerStatus(),
        metrics.getDecommissionedTaskTrackerCount());
    } catch (InterruptedException ie) {
      throw new IOException(ie);
    }
  }

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