@Override
    public void toData(DataOutput out,
        SerializationContext context) throws IOException {
      super.toData(out, context);
      DataSerializer.writeObject(eventID, out);
      DataSerializer.writePrimitiveInt(serialNum, out);
      DataSerializer.writePrimitiveBoolean(notifyOfRegionDeparture, out);
      DataSerializer.writeHashMap(subregionSerialNumbers, out);
    }
Return true if a reply should be sent
geode-core/src/main/java/org/apache/geode/internal/cache/DestroyRegionOperation.java