@Override
  public EncodedSeeker createSeeker(final HFileBlockDecodingContext decodingCtx) {
    return new SeekerStateBufferedEncodedSeeker(decodingCtx);
  }
Just copy data, do not do any kind of compression. Use for comparison and benchmarking.
hbase-common/src/main/java/org/apache/hadoop/hbase/io/encoding/CopyKeyDataBlockEncoder.java