/** {@inheritDoc} */
    @Override
    protected IgniteBiTuple<Long, List<IgniteExceptionRegistry.ExceptionInfo>> run(
        Map<UUID, Long> arg) {
      Long lastOrder = arg.get(ignite.localNode().id());

      long order = lastOrder != null ? lastOrder : 0;

      List<IgniteExceptionRegistry.ExceptionInfo> errors =
          ignite.context().exceptionRegistry().getErrors(order);

      List<IgniteExceptionRegistry.ExceptionInfo> wrapped = new ArrayList<>(errors.size());

      for (IgniteExceptionRegistry.ExceptionInfo error : errors) {
        if (error.order() > order) order = error.order();

        wrapped.add(
            new IgniteExceptionRegistry.ExceptionInfo(
                error.order(),
                new VisorExceptionWrapper(error.error()),
                error.message(),
                error.threadId(),
                error.threadName(),
                error.time()));
      }

      return new IgniteBiTuple<>(order, wrapped);
    }
  /**
   * Load grid configuration for specified node type.
   *
   * @param type Node type to load configuration for.
   * @return Grid configuration for specified node type.
   */
  static IgniteConfiguration getConfig(String type) {
    String path = NODE_CFG.get(type);

    if (path == null) throw new IllegalArgumentException("Unsupported node type: " + type);

    URL url = U.resolveIgniteUrl(path);

    BeanFactory ctx = new FileSystemXmlApplicationContext(url.toString());

    return (IgniteConfiguration) ctx.getBean("grid.cfg");
  }
  /**
   * Example for start/stop node tasks.
   *
   * @param args Not used.
   */
  public static void main(String[] args) {
    String nodeType = "tcp+ssl";

    // Start initial node = 1
    try (Ignite g = G.start(NODE_CFG.get(nodeType))) {
      // Change topology.
      changeTopology(g, 4, 1, nodeType);
      changeTopology(g, 1, 4, nodeType);

      // Stop node by id = 0
      g.compute().execute(ClientStopNodeTask.class, g.cluster().localNode().id().toString());

      // Wait for node stops.
      // U.sleep(1000);

      assert G.allGrids().isEmpty();
    } catch (Exception e) {
      System.err.println("Uncaught exception: " + e.getMessage());

      e.printStackTrace(System.err);
    }
  }