docs: private void initOppositeMainStemStatus() {
          String path = null;
          try {
              path = StagePathUtils.getOppositeMainStem(getPipelineId());
              byte[] bytes = zookeeper.readData(path);
              initOppositeMainStemStatus(bytes);
          } catch (ZkNoNodeException e) {
              // mainstem节点挂了后，状态直接修改为taking
              oppositeMainStemStatus = MainStemEventData.Status.TAKEING;
              permitSem();
          } catch (ZkException e) {
              logger.error(path, e);
          }
      }