@Override
    public String toString() {
      String s = super.toString();
      StringBuilder sb = new StringBuilder();
      sb.append(s.charAt(0));
      sb.append(s.substring(1).toLowerCase(Locale.ROOT));
      return sb.toString();
    }
Compression algorithm to use if not specified on the command line
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/DataBlockEncodingTool.java