Esempio n. 1
0
    /**
     * Increase the count of running tasks and disk loads for a certain task runner.
     *
     * @param volumeId Volume identifier
     * @return the volume load (i.e., how many running tasks use this volume)
     */
    private synchronized int increaseConcurrency(int volumeId) {

      int concurrency = 1;
      if (diskVolumeLoads.containsKey(volumeId)) {
        concurrency = diskVolumeLoads.get(volumeId) + 1;
      }

      if (volumeId > -1) {
        LOG.info(
            "Assigned host : "
                + host
                + ", Volume : "
                + volumeId
                + ", Concurrency : "
                + concurrency);
      } else if (volumeId == -1) {
        // this case is disabled namenode block meta or compressed text file or amazon s3
        LOG.info(
            "Assigned host : "
                + host
                + ", Unknown Volume : "
                + volumeId
                + ", Concurrency : "
                + concurrency);
      } else if (volumeId == REMOTE) {
        // this case has processed all block on host and it will be assigned to remote
        LOG.info(
            "Assigned host : "
                + host
                + ", Remaining local tasks : "
                + getRemainingLocalTaskSize()
                + ", Remote Concurrency : "
                + concurrency);
      }
      diskVolumeLoads.put(volumeId, concurrency);
      return concurrency;
    }
Esempio n. 2
0
    public void assignToLeafTasks(LinkedList<TaskRequestEvent> taskRequests) {
      Collections.shuffle(taskRequests);
      LinkedList<TaskRequestEvent> remoteTaskRequests = new LinkedList<>();
      String queryMasterHostAndPort =
          context
              .getMasterContext()
              .getQueryMasterContext()
              .getWorkerContext()
              .getConnectionInfo()
              .getHostAndQMPort();

      TaskRequestEvent taskRequest;
      while (leafTasks.size() > 0 && (!taskRequests.isEmpty() || !remoteTaskRequests.isEmpty())) {
        int localAssign = 0;
        int rackAssign = 0;

        taskRequest = taskRequests.pollFirst();
        if (taskRequest == null) { // if there are only remote task requests
          taskRequest = remoteTaskRequests.pollFirst();
        }

        // checking if this container is still alive.
        // If not, ignore the task request and stop the task runner
        WorkerConnectionInfo connectionInfo =
            context.getMasterContext().getWorkerMap().get(taskRequest.getWorkerId());
        if (connectionInfo == null) continue;

        // getting the hostname of requested node
        String host = connectionInfo.getHost();

        // if there are no worker matched to the hostname a task request
        if (!leafTaskHostMapping.containsKey(host) && !taskRequests.isEmpty()) {
          String normalizedHost = NetUtils.normalizeHost(host);

          if (!leafTaskHostMapping.containsKey(normalizedHost)) {
            // this case means one of either cases:
            // * there are no blocks which reside in this node.
            // * all blocks which reside in this node are consumed, and this task runner requests a
            // remote task.
            // In this case, we transfer the task request to the remote task request list, and skip
            // the followings.
            remoteTaskRequests.add(taskRequest);
            continue;
          } else {
            host = normalizedHost;
          }
        }

        if (LOG.isDebugEnabled()) {
          LOG.debug(
              "assignToLeafTasks: "
                  + taskRequest.getExecutionBlockId()
                  + ","
                  + "worker="
                  + connectionInfo.getHostAndPeerRpcPort());
        }

        //////////////////////////////////////////////////////////////////////
        // disk or host-local allocation
        //////////////////////////////////////////////////////////////////////
        TaskAttemptId attemptId = allocateLocalTask(host);

        if (attemptId == null) { // if a local task cannot be found
          HostVolumeMapping hostVolumeMapping = leafTaskHostMapping.get(host);

          if (!taskRequests
              .isEmpty()) { // if other requests remains, move to remote list for better locality
            remoteTaskRequests.add(taskRequest);
            candidateWorkers.remove(connectionInfo.getId());
            continue;

          } else {
            if (hostVolumeMapping != null) {
              int nodes = context.getMasterContext().getWorkerMap().size();
              // this part is to control the assignment of tail and remote task balancing per node
              int tailLimit = 1;
              if (remainingScheduledObjectNum() > 0 && nodes > 0) {
                tailLimit = Math.max(remainingScheduledObjectNum() / nodes, 1);
              }

              if (hostVolumeMapping.getRemoteConcurrency()
                  >= tailLimit) { // remote task throttling per node
                continue;
              } else {
                // assign to remote volume
                hostVolumeMapping.increaseConcurrency(HostVolumeMapping.REMOTE);
              }
            }
          }

          //////////////////////////////////////////////////////////////////////
          // rack-local allocation
          //////////////////////////////////////////////////////////////////////
          attemptId = allocateRackTask(host);

          //////////////////////////////////////////////////////////////////////
          // random node allocation
          //////////////////////////////////////////////////////////////////////
          if (attemptId == null && leafTaskNum() > 0) {
            synchronized (leafTasks) {
              attemptId = leafTasks.iterator().next();
              leafTasks.remove(attemptId);
            }
          }

          if (attemptId != null && hostVolumeMapping != null) {
            hostVolumeMapping.lastAssignedVolumeId.put(attemptId, HostVolumeMapping.REMOTE);
          }
          rackAssign++;
        } else {
          localAssign++;
        }

        if (attemptId != null) {
          Task task = stage.getTask(attemptId.getTaskId());
          TaskRequest taskAssign =
              new TaskRequestImpl(
                  attemptId,
                  new ArrayList<>(task.getAllFragments()),
                  "",
                  false,
                  LogicalNodeSerializer.serialize(task.getLogicalPlan()),
                  context.getMasterContext().getQueryContext(),
                  stage.getDataChannel(),
                  stage.getBlock().getEnforcer(),
                  queryMasterHostAndPort);

          if (checkIfInterQuery(stage.getMasterPlan(), stage.getBlock())) {
            taskAssign.setInterQuery();
          }

          // TODO send batch request
          BatchAllocationRequest.Builder requestProto = BatchAllocationRequest.newBuilder();
          requestProto.addTaskRequest(
              TaskAllocationProto.newBuilder()
                  .setResource(taskRequest.getResponseProto().getResource())
                  .setTaskRequest(taskAssign.getProto())
                  .build());

          requestProto.setExecutionBlockId(attemptId.getTaskId().getExecutionBlockId().getProto());
          context
              .getMasterContext()
              .getEventHandler()
              .handle(new TaskAttemptAssignedEvent(attemptId, connectionInfo));

          InetSocketAddress addr = stage.getAssignedWorkerMap().get(connectionInfo.getId());
          if (addr == null)
            addr = new InetSocketAddress(connectionInfo.getHost(), connectionInfo.getPeerRpcPort());

          AsyncRpcClient tajoWorkerRpc = null;
          CallFuture<BatchAllocationResponse> callFuture = new CallFuture<>();
          totalAttempts++;
          try {
            tajoWorkerRpc =
                RpcClientManager.getInstance()
                    .getClient(addr, TajoWorkerProtocol.class, true, rpcParams);

            TajoWorkerProtocol.TajoWorkerProtocolService tajoWorkerRpcClient =
                tajoWorkerRpc.getStub();
            tajoWorkerRpcClient.allocateTasks(
                callFuture.getController(), requestProto.build(), callFuture);

            BatchAllocationResponse responseProto =
                callFuture.get(RpcConstants.FUTURE_TIMEOUT_SECONDS_DEFAULT, TimeUnit.SECONDS);

            if (responseProto.getCancellationTaskCount() > 0) {
              for (TaskAllocationProto proto : responseProto.getCancellationTaskList()) {
                cancel(task.getAttempt(new TaskAttemptId(proto.getTaskRequest().getId())));
                cancellation++;
              }

              if (LOG.isDebugEnabled()) {
                LOG.debug(
                    "Canceled requests: "
                        + responseProto.getCancellationTaskCount()
                        + " from "
                        + addr);
              }
              continue;
            }
          } catch (Exception e) {
            LOG.error(e);
          }
          scheduledObjectNum--;
          totalAssigned++;
          hostLocalAssigned += localAssign;
          rackLocalAssigned += rackAssign;

          if (rackAssign > 0) {
            LOG.info(
                String.format(
                    "Assigned Local/Rack/Total: (%d/%d/%d), "
                        + "Attempted Cancel/Assign/Total: (%d/%d/%d), "
                        + "Locality: %.2f%%, Rack host: %s",
                    hostLocalAssigned,
                    rackLocalAssigned,
                    totalAssigned,
                    cancellation,
                    totalAssigned,
                    totalAttempts,
                    ((double) hostLocalAssigned / (double) totalAssigned) * 100,
                    host));
          }

        } else {
          throw new RuntimeException("Illegal State!!!!!!!!!!!!!!!!!!!!!");
        }
      }
    }