@Override
  public void toData(DataOutput out,
      SerializationContext context) throws IOException {
    super.toData(out, context);
    DataSerializer.writeInteger(this.reason, out);
    DataSerializer.writeHashMap(this.regionToDuplicateEventsMap, out);
  }
Sets events in the remote secondary queues to possible duplicate

@since Geode 1.15
geode-core/src/main/java/org/apache/geode/internal/cache/wan/parallel/ParallelQueueSetPossibleDuplicateMessage.java