docs: void userSnapshotRequestExistenceCheck(boolean deleteExistingRequest) throws Exception {
          if (deleteExistingRequest) {
              m_zk.delete(VoltZK.user_snapshot_request, -1, null, null);
          }
          if (m_zk.exists(VoltZK.user_snapshot_request, m_userSnapshotRequestExistenceWatcher) != null) {
              processUserSnapshotRequestEvent(new WatchedEvent(
                      EventType.NodeCreated,
                      KeeperState.SyncConnected,
                      VoltZK.user_snapshot_request));
          }
      }