docs: private String createRequestNode(SnapshotInitiationInfo snapInfo)
      {
          String requestId = null;
  
          try {
              requestId = java.util.UUID.randomUUID().toString();
              if (!snapInfo.isTruncationRequest()) {
                  final JSONObject jsObj = snapInfo.getJSONObjectForZK();
                  jsObj.put("requestId", requestId);
                  String zkString = jsObj.toString(4);
                  byte zkBytes[] = zkString.getBytes("UTF-8");
  
                  m_zk.create(VoltZK.user_snapshot_request, zkBytes, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
              }
              else {
                  m_zk.create(VoltZK.request_truncation_snapshot_node, null,
                          Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT_SEQUENTIAL);
              }
          } catch (KeeperException.NodeExistsException e) {
              return null;
          } catch (Exception e) {
              VoltDB.crashLocalVoltDB("Exception while attempting to create user snapshot request in ZK", true, e);
          }
  
          return requestId;
      }