@Override
  public void setDictionary(byte[] b, int off, int len) {
    throw new UnsupportedOperationException("setDictionary is not supported");
  }
Hadoop compressor glue for Xerial Snappy.
hbase-compression/hbase-compression-snappy/src/main/java/org/apache/hadoop/hbase/io/compress/xerial/SnappyCompressor.java