@Override
  public boolean release() {
    if (bufferToSend != null) {
      ReferenceCountUtil.safeRelease(bufferToSend);
      bufferToSend = null;
    }
    if (toSend != null) {
      ReferenceCountUtil.safeRelease(toSend);
      toSend = null;
    }
    return false;
  }
Override the release method from {@link RequestOrResponse}. When the {@link #prepareBuffer()} is not invoked, there
will be {@link #toSend}'s content waiting for releasing.
@return
ambry-protocol/src/main/java/com/github/ambry/protocol/GetResponse.java