@Override
  public void toData(DataOutput out,
      SerializationContext context) throws IOException {
    super.toData(out, context);
    out.writeInt(processorId);
    InternalDataSerializer.invokeToData(txLockId, out);
    DataSerializer.writeString(serviceName, out);
    InternalDataSerializer.writeSet(updatedParticipants, out);
  }
Update the Grantor with a new set of Participants. This method is meant to be used in a local
context (does <b>NOT</b> involve any messaging)
geode-core/src/main/java/org/apache/geode/internal/cache/locks/TXLockUpdateParticipantsMessage.java