@SuppressWarnings("unchecked")
                List<? extends PlannedTask> taskPlan = (List<? extends PlannedTask>) plannedNodeGraph.getNodes(PlannedNodeGraph.DetailLevel.LEVEL1_TASKS);
                return ImmutableList.copyOf(taskPlan);
            }

            @Override
            public List<PlannedNode> getExecutionPlan(Set<NodeIdentity.NodeType> types) {