code: public void run()
      {
          // respond to the request that triggered this validation
          if (!initiator.equals(FBUtilities.getBroadcastAddress()))
              logger.info(String.format("[repair #%s] Sending completed merkle tree to %s for %s/%s", desc.sessionId, initiator, desc.keyspace, desc.columnFamily));
          MessagingService.instance().sendOneWay(new ValidationComplete(desc, tree).createMessage(), initiator);
      }
docs: Called after the validation lifecycle to respond with the now valid tree. Runs in Stage.ANTIENTROPY.