@Override
  public long sizeInBytes() {
    return super.sizeInBytes() + (Partition_Response_Info_List_Size + partitionResponseInfoSize) + ((toSend == null)
        ? sendSizeInBufferToSend : toSend.sizeInBytes());
  }
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