@Override
  public int internalEncode(ExtendedCell cell, HFileBlockDefaultEncodingContext encodingContext,
    DataOutputStream out) throws IOException {
    CopyKeyEncodingState state = (CopyKeyEncodingState) encodingContext.getEncodingState();
    NoneEncoder encoder = state.encoder;
    return encoder.write(cell);
  }
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