Exemplo n.º 1
0
  private void runPhysicalPlan(final PhysicalPlan plan) throws ExecutionSetupException {
    validatePlan(plan);
    setupSortMemoryAllocations(plan);
    acquireQuerySemaphore(plan);

    final QueryWorkUnit work = getQueryWorkUnit(plan);
    final List<PlanFragment> planFragments = work.getFragments();
    final PlanFragment rootPlanFragment = work.getRootFragment();
    assert queryId == rootPlanFragment.getHandle().getQueryId();

    drillbitContext
        .getWorkBus()
        .addFragmentStatusListener(queryId, queryManager.getFragmentStatusListener());
    drillbitContext
        .getClusterCoordinator()
        .addDrillbitStatusListener(queryManager.getDrillbitStatusListener());

    logger.debug("Submitting fragments to run.");

    // set up the root fragment first so we'll have incoming buffers available.
    setupRootFragment(rootPlanFragment, work.getRootOperator());

    setupNonRootFragments(planFragments);
    drillbitContext.getAllocator().resetFragmentLimits(); // TODO a global effect for this query?!?

    moveToState(QueryState.RUNNING, null);
    logger.debug("Fragments running.");
  }
Exemplo n.º 2
0
  /**
   * This limits the number of "small" and "large" queries that a Drill cluster will run
   * simultaneously, if queueing is enabled. If the query is unable to run, this will block until it
   * can. Beware that this is called under run(), and so will consume a Thread while it waits for
   * the required distributed semaphore.
   *
   * @param plan the query plan
   * @throws ForemanSetupException
   */
  private void acquireQuerySemaphore(final PhysicalPlan plan) throws ForemanSetupException {
    final OptionManager optionManager = queryContext.getOptions();
    final boolean queuingEnabled = optionManager.getOption(ExecConstants.ENABLE_QUEUE);
    if (queuingEnabled) {
      final long queueThreshold = optionManager.getOption(ExecConstants.QUEUE_THRESHOLD_SIZE);
      double totalCost = 0;
      for (final PhysicalOperator ops : plan.getSortedOperators()) {
        totalCost += ops.getCost();
      }

      final long queueTimeout = optionManager.getOption(ExecConstants.QUEUE_TIMEOUT);
      final String queueName;

      try {
        @SuppressWarnings("resource")
        final ClusterCoordinator clusterCoordinator = drillbitContext.getClusterCoordinator();
        final DistributedSemaphore distributedSemaphore;

        // get the appropriate semaphore
        if (totalCost > queueThreshold) {
          final int largeQueue = (int) optionManager.getOption(ExecConstants.LARGE_QUEUE_SIZE);
          distributedSemaphore = clusterCoordinator.getSemaphore("query.large", largeQueue);
          queueName = "large";
        } else {
          final int smallQueue = (int) optionManager.getOption(ExecConstants.SMALL_QUEUE_SIZE);
          distributedSemaphore = clusterCoordinator.getSemaphore("query.small", smallQueue);
          queueName = "small";
        }

        lease = distributedSemaphore.acquire(queueTimeout, TimeUnit.MILLISECONDS);
      } catch (final Exception e) {
        throw new ForemanSetupException("Unable to acquire slot for query.", e);
      }

      if (lease == null) {
        throw UserException.resourceError()
            .message(
                "Unable to acquire queue resources for query within timeout.  Timeout for %s queue was set at %d seconds.",
                queueName, queueTimeout / 1000)
            .build(logger);
      }
    }
  }
Exemplo n.º 3
0
  @Override
  public void run() {
    // if a cancel thread has already entered this executor, we have not reason to continue.
    if (!hasCloseoutThread.compareAndSet(false, true)) {
      return;
    }

    final Thread myThread = Thread.currentThread();
    myThreadRef.set(myThread);
    final String originalThreadName = myThread.getName();
    final FragmentHandle fragmentHandle = fragmentContext.getHandle();
    final DrillbitContext drillbitContext = fragmentContext.getDrillbitContext();
    final ClusterCoordinator clusterCoordinator = drillbitContext.getClusterCoordinator();
    final DrillbitStatusListener drillbitStatusListener = new FragmentDrillbitStatusListener();
    final String newThreadName = QueryIdHelper.getExecutorThreadName(fragmentHandle);

    try {

      myThread.setName(newThreadName);

      // if we didn't get the root operator when the executor was created, create it now.
      final FragmentRoot rootOperator =
          this.rootOperator != null
              ? this.rootOperator
              : drillbitContext.getPlanReader().readFragmentOperator(fragment.getFragmentJson());

      root = ImplCreator.getExec(fragmentContext, rootOperator);
      if (root == null) {
        return;
      }

      clusterCoordinator.addDrillbitStatusListener(drillbitStatusListener);
      updateState(FragmentState.RUNNING);

      acceptExternalEvents.countDown();
      injector.injectPause(fragmentContext.getExecutionControls(), "fragment-running", logger);

      final DrillbitEndpoint endpoint = drillbitContext.getEndpoint();
      logger.debug(
          "Starting fragment {}:{} on {}:{}",
          fragmentHandle.getMajorFragmentId(),
          fragmentHandle.getMinorFragmentId(),
          endpoint.getAddress(),
          endpoint.getUserPort());

      final UserGroupInformation queryUserUgi =
          fragmentContext.isImpersonationEnabled()
              ? ImpersonationUtil.createProxyUgi(fragmentContext.getQueryUserName())
              : ImpersonationUtil.getProcessUserUGI();

      queryUserUgi.doAs(
          new PrivilegedExceptionAction<Void>() {
            public Void run() throws Exception {
              injector.injectChecked(
                  fragmentContext.getExecutionControls(), "fragment-execution", IOException.class);
              /*
               * Run the query until root.next returns false OR we no longer need to continue.
               */
              while (shouldContinue() && root.next()) {
                // loop
              }

              return null;
            }
          });

    } catch (OutOfMemoryError | OutOfMemoryException e) {
      if (!(e instanceof OutOfMemoryError) || "Direct buffer memory".equals(e.getMessage())) {
        fail(UserException.memoryError(e).build(logger));
      } else {
        // we have a heap out of memory error. The JVM in unstable, exit.
        CatastrophicFailure.exit(
            e, "Unable to handle out of memory condition in FragmentExecutor.", -2);
      }
    } catch (AssertionError | Exception e) {
      fail(e);
    } finally {

      // no longer allow this thread to be interrupted. We synchronize here to make sure that cancel
      // can't set an
      // interruption after we have moved beyond this block.
      synchronized (myThreadRef) {
        myThreadRef.set(null);
        Thread.interrupted();
      }

      // We need to sure we countDown at least once. We'll do it here to guarantee that.
      acceptExternalEvents.countDown();

      // here we could be in FAILED, RUNNING, or CANCELLATION_REQUESTED
      cleanup(FragmentState.FINISHED);

      clusterCoordinator.removeDrillbitStatusListener(drillbitStatusListener);

      myThread.setName(originalThreadName);
    }
  }