@Override
      public synchronized InputStream createDecompressionStream(InputStream downStream,
        Decompressor decompressor, int downStreamBufferSize) throws IOException {
        if (downStreamBufferSize > 0) {
          return new BufferedInputStream(downStream, downStreamBufferSize);
        }
        return downStream;
      }
Compression algorithms. The ordinal of these cannot change or else you risk breaking all
existing HFiles out there. Even the ones that are not compressed! (They use the NONE algorithm)
hbase-common/src/main/java/org/apache/hadoop/hbase/io/compress/Compression.java