@Override
  public void fromData(DataInput in,
      DeserializationContext context) throws IOException, ClassNotFoundException {
    super.fromData(in, context);
    DataSerializer.readArrayList(in); /* read unused data for backwards compatibility */
    in.readByte(); /* read unused data for backwards compatibility */
  }
Sends a message for {@link java.util.Map#size()} ignoring any errors on send

@param distributedMember the set of members that the size message is sent to
@param r the Region to get the size of
@return the processor used to read the returned size
geode-core/src/main/java/org/apache/geode/internal/cache/tx/RemoteSizeMessage.java