docs: void createZKDirectory(String path) {
          try {
              try {
                  m_zk.create(path, new byte[0],
                              Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
              } catch (KeeperException e) {
                  if (e.code() != Code.NODEEXISTS) {
                      throw e;
                  }
              }
          } catch (Exception e) {
              VoltDB.crashGlobalVoltDB("Failed to create Zookeeper node: " + e.getMessage(),
                                       false, e);
          }
      }