docs: public static Deferred<Boolean> counterExistsInStorage(final TSDB tsdb, 
        final byte[] tsuid) {
      final GetRequest get = new GetRequest(tsdb.metaTable(), tsuid);
      get.family(FAMILY);
      get.qualifier(COUNTER_QUALIFIER);
      
      /**
       * Callback from the GetRequest that simply determines if the row is empty
       * or not
       */
      final class ExistsCB implements Callback<Boolean, ArrayList<KeyValue>> {
  
        @Override
        public Boolean call(ArrayList<KeyValue> row) throws Exception {
          if (row == null || row.isEmpty() || row.get(0).value() == null) {
            return false;
          }
          return true;
        }
        
      }
      
      return tsdb.getClient().get(get).addCallback(new ExistsCB());
    }