class RDBStore implements DBStore {

  @Override
  public long getEstimatedKeyCount() throws IOException {
    try {
      return db.getLongProperty("rocksdb.estimate-num-keys");
    } catch (RocksDBException e) {
      throw toIOException("Unable to get the estimated count.", e);
    }
  }

  @VisibleForTesting public  RDBStore(File dbFile, DBOptions options,
                  Set<TableConfig> families);
  public  RDBStore(File dbFile, DBOptions options,
      WriteOptions writeOptions, Set<TableConfig> families,
                  CodecRegistry registry);

}