docs: public static ZKUtil.StringCallback createSnapshotCompletionNode(String path,
                                                                       String pathType,
                                                                       String nonce,
                                                                       long txnId,
                                                                       boolean isTruncation,
                                                                       String truncReqId) {
          if (!(txnId > 0)) {
              VoltDB.crashGlobalVoltDB("Txnid must be greather than 0", true, null);
          }
  
          byte nodeBytes[] = null;
          try {
              JSONStringer stringer = new JSONStringer();
              stringer.object();
              stringer.keySymbolValuePair("txnId", txnId);
              stringer.keySymbolValuePair("isTruncation", isTruncation);
              stringer.keySymbolValuePair("didSucceed", true);
              stringer.keySymbolValuePair("hostCount", -1);
              stringer.keySymbolValuePair(SnapshotUtil.JSON_PATH, path);
              stringer.keySymbolValuePair(SnapshotUtil.JSON_PATH_TYPE, pathType);
              stringer.keySymbolValuePair(SnapshotUtil.JSON_NONCE, nonce);
              stringer.keySymbolValuePair("truncReqId", truncReqId);
              stringer.key("exportSequenceNumbers").object().endObject();
              stringer.endObject();
              JSONObject jsonObj = new JSONObject(stringer.toString());
              nodeBytes = jsonObj.toString(4).getBytes(Charsets.UTF_8);
          } catch (Exception e) {
              VoltDB.crashLocalVoltDB("Error serializing snapshot completion node JSON", true, e);
          }
  
          ZKUtil.StringCallback cb = new ZKUtil.StringCallback();
          final String snapshotPath = VoltZK.completed_snapshots + "/" +  txnId;
          VoltDB.instance().getHostMessenger().getZK().create(
                  snapshotPath, nodeBytes, Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT,
                  cb, null);
  
          return cb;
      }