code: @Override
    public void onContainersCompleted(final List<ContainerStatus> completedContainers) {
      for (final ContainerStatus containerStatus : completedContainers) {
        this.onContainerStatus(containerStatus);
      }
    }
docs: RM Callback: RM reports some completed containers. Update status of each container in the list.
  @param completedContainers list of completed containers.