o one of the frontend services, it will be delegated to one of the
backend workers, which performs the transformation job, and sends the result back to
the original client. New backend nodes, as well as new frontend nodes, can be
added or removed to the cluster dynamically.
</p>

<p>
Open <a href="#code/src/main/java/sample/cluster/transformation/TransformationMessages.java" class="shortcut">TransformationMessages.java</a>.
It defines the messages that are sent between the actors.
</p>

<p>
The backend work