@Override
    public void toData(DataOutput out,
        SerializationContext context) throws IOException {
      super.toData(out, context);
      out.writeByte(replyCode);
      DataSerializer.writeObjectArray(heldLocks, out);
    }
Identifies who the responder believes the lock grantor currently is
geode-core/src/main/java/org/apache/geode/distributed/internal/locks/DLockRecoverGrantorProcessor.java