er that performs the transformation job is defined in 
<a href="#code/src/main/java/sample/cluster/transformation/TransformationBackend.java" class="shortcut">TransformationBackend.java</a>
</p>

<p>
Note that the <code>TransformationBackend</code> actor subscribes to cluster events to detect new,
potential, frontend nodes, and send them a registration message so that they know
that they can use the backend worker.
</p>

<p>
The frontend that receives user jobs and delegates to one of the registered backend