public long sizeInBytes() {
    try {
      return super.sizeInBytes() + partitionId.getBytes().length + FILE_NAME_FIELD_SIZE_IN_BYTES +
          fileName.length() + Long.BYTES + Long.BYTES + 1 + Integer.BYTES +
          (chunkStream != null ? chunkStream.available() : 0);
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
  }
Get the size of the response in bytes.
@return long
ambry-protocol/src/main/java/com/github/ambry/protocol/FileCopyGetChunkResponse.java