Beispiel #1
0
    private TaskAttemptId allocateLocalTask(String host) {
      HostVolumeMapping hostVolumeMapping = leafTaskHostMapping.get(host);

      if (hostVolumeMapping != null) { // tajo host is located in hadoop datanode
        for (int i = 0; i < hostVolumeMapping.getRemainingLocalTaskSize(); i++) {
          TaskAttemptId attemptId = hostVolumeMapping.getLocalTask();

          if (attemptId == null) break;
          // find remaining local task
          if (leafTasks.contains(attemptId)) {
            leafTasks.remove(attemptId);
            return attemptId;
          }
        }
      }
      return null;
    }
Beispiel #2
0
    private TaskAttemptId allocateRackTask(String host) {

      List<HostVolumeMapping> remainingTasks = Lists.newArrayList(leafTaskHostMapping.values());
      String rack = RackResolver.resolve(host).getNetworkLocation();
      TaskAttemptId attemptId = null;

      if (remainingTasks.size() > 0) {
        synchronized (scheduledRequests) {
          // find largest remaining task of other host in rack
          Collections.sort(
              remainingTasks,
              new Comparator<HostVolumeMapping>() {
                @Override
                public int compare(HostVolumeMapping v1, HostVolumeMapping v2) {
                  // descending remaining tasks
                  if (v2.remainTasksNum.get() > v1.remainTasksNum.get()) {
                    return 1;
                  } else if (v2.remainTasksNum.get() == v1.remainTasksNum.get()) {
                    return 0;
                  } else {
                    return -1;
                  }
                }
              });
        }

        for (HostVolumeMapping tasks : remainingTasks) {
          for (int i = 0; i < tasks.getRemainingLocalTaskSize(); i++) {
            TaskAttemptId tId = tasks.getTaskAttemptIdByRack(rack);

            if (tId == null) break;

            if (leafTasks.contains(tId)) {
              leafTasks.remove(tId);
              attemptId = tId;
              break;
            }
          }
          if (attemptId != null) break;
        }
      }

      // find task in rack
      if (attemptId == null) {
        HashSet<TaskAttemptId> list = leafTasksRackMapping.get(rack);
        if (list != null) {
          synchronized (list) {
            Iterator<TaskAttemptId> iterator = list.iterator();
            while (iterator.hasNext()) {
              TaskAttemptId tId = iterator.next();
              iterator.remove();
              if (leafTasks.contains(tId)) {
                leafTasks.remove(tId);
                attemptId = tId;
                break;
              }
            }
          }
        }
      }

      return attemptId;
    }