Exemplo n.º 1
0
  /**
   * Called by execution pool to do query setup, and kick off remote execution.
   *
   * <p>Note that completion of this function is not the end of the Foreman's role in the query's
   * lifecycle.
   */
  @Override
  public void run() {
    // rename the thread we're using for debugging purposes
    final Thread currentThread = Thread.currentThread();
    final String originalName = currentThread.getName();
    currentThread.setName(QueryIdHelper.getQueryId(queryId) + ":foreman");

    // track how long the query takes
    queryManager.markStartTime();

    try {
      injector.injectChecked(
          queryContext.getExecutionControls(), "run-try-beginning", ForemanException.class);
      queryText = queryRequest.getPlan();

      // convert a run query request into action
      switch (queryRequest.getType()) {
        case LOGICAL:
          parseAndRunLogicalPlan(queryRequest.getPlan());
          break;
        case PHYSICAL:
          parseAndRunPhysicalPlan(queryRequest.getPlan());
          break;
        case SQL:
          runSQL(queryRequest.getPlan());
          break;
        default:
          throw new IllegalStateException();
      }
      injector.injectChecked(
          queryContext.getExecutionControls(), "run-try-end", ForemanException.class);
    } catch (final OutOfMemoryException | OutOfMemoryRuntimeException e) {
      moveToState(QueryState.FAILED, UserException.memoryError(e).build(logger));
    } catch (final ForemanException e) {
      moveToState(QueryState.FAILED, e);
    } catch (AssertionError | Exception ex) {
      moveToState(
          QueryState.FAILED,
          new ForemanException(
              "Unexpected exception during fragment initialization: " + ex.getMessage(), ex));
    } catch (final OutOfMemoryError e) {
      if ("Direct buffer memory".equals(e.getMessage())) {
        moveToState(
            QueryState.FAILED,
            UserException.resourceError(e)
                .message("One or more nodes ran out of memory while executing the query.")
                .build(logger));
      } else {
        /*
         * FragmentExecutors use a DrillbitStatusListener to watch out for the death of their query's Foreman. So, if we
         * die here, they should get notified about that, and cancel themselves; we don't have to attempt to notify
         * them, which might not work under these conditions.
         */
        System.out.println("Node ran out of Heap memory, exiting.");
        e.printStackTrace();
        System.out.flush();
        System.exit(-1);
      }

    } finally {
      /*
       * Begin accepting external events.
       *
       * Doing this here in the finally clause will guarantee that it occurs. Otherwise, if there
       * is an exception anywhere during setup, it wouldn't occur, and any events that are generated
       * as a result of any partial setup that was done (such as the FragmentSubmitListener,
       * the ResponseSendListener, or an external call to cancel()), will hang the thread that makes the
       * event delivery call.
       *
       * If we do throw an exception during setup, and have already moved to QueryState.FAILED, we just need to
       * make sure that we can't make things any worse as those events are delivered, but allow
       * any necessary remaining cleanup to proceed.
       *
       * Note that cancellations cannot be simulated before this point, i.e. pauses can be injected, because Foreman
       * would wait on the cancelling thread to signal a resume and the cancelling thread would wait on the Foreman
       * to accept events.
       */
      acceptExternalEvents.countDown();

      // If we received the resume signal before fragments are setup, the first call does not
      // actually resume the
      // fragments. Since setup is done, all fragments must have been delivered to remote nodes. Now
      // we can resume.
      if (resume) {
        resume();
      }
      injector.injectPause(queryContext.getExecutionControls(), "foreman-ready", logger);

      // restore the thread's original name
      currentThread.setName(originalName);
    }

    /*
     * Note that despite the run() completing, the Foreman continues to exist, and receives
     * events (indirectly, through the QueryManager's use of stateListener), about fragment
     * completions. It won't go away until everything is completed, failed, or cancelled.
     */
  }
Exemplo n.º 2
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);
    }
  }