@Override
  public void startBlockEncoding(HFileBlockEncodingContext encodingCtx, DataOutputStream out)
    throws IOException {
    if (this.encoding != null && this.encoding != DataBlockEncoding.NONE) {
      this.encoding.getEncoder().startBlockEncoding(encodingCtx, out);
    }
  }
Do data block encoding with specified options.
@param encoding What kind of data block encoding will be used.
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileDataBlockEncoderImpl.java