code: private Configuration loadConfigurationFromMetadataBuffer(Buffer buffer) {
      if (buffer.position(12).readByte() == 1) {
        return new Configuration(
          buffer.readLong(),
          buffer.readLong(),
          buffer.readLong(),
          serializer.readObject(buffer)
        );
      }
      return null;
    }
docs: Note: used in backward compatibility code with pre 1.2.6 release. This can be removed in later releases.