A tunnel is created for each sender, and when you ask it will be a
different sender for each request. The tunnel actors will by default be
stopped after 30 seconds of inactivity. When you use ask you should
probably reduce this timeout to be similar to your ask timeout, a few
seconds.
```
I have a Akka project utilizing the cluster client. I've found that
"ask"ing the ClusterReceptionist a large volume (100's) of questions
creates a large number of ClientResponseTunnel actors as children of the
ClusterReceptionist. Although the actor associated with the
ClusterReceptionist
