docs: static long getMaxMetricID(final TSDB tsdb) {
      // first up, we need the max metric ID so we can split up the data table
      // amongst threads.
      final GetRequest get = new GetRequest(tsdb.uidTable(), new byte[] { 0 });
      get.family("id".getBytes(CHARSET));
      get.qualifier("metrics".getBytes(CHARSET));
      ArrayList<KeyValue> row;
      try {
        row = tsdb.getClient().get(get).joinUninterruptibly();
        if (row == null || row.isEmpty()) {
          return 0;
        }
        final byte[] id_bytes = row.get(0).value();
        if (id_bytes.length != 8) {
          throw new IllegalStateException("Invalid metric max UID, wrong # of bytes");
        }
        return Bytes.getLong(id_bytes);
      } catch (Exception e) {
        throw new RuntimeException("Shouldn't be here", e);
      }
    }