As @mengdahl already said, SNAP is not a cluster or super-computer software, but it can be used on a cluster. Clusters can be operated differently and thus it is the task of the cluster operators to integrate SNAP. You can use Apache Hadoop or Spark or other means.
I think the remote execution tool included in SNAP was implemented and used by @kraftek. Maybe he has some hints how you can use it.
The team at Brockmann offers Calvalus which you can use to run your cluster and it has special support for SNAP.
- Big data in Earth Observation – Brockmann Consult (brockmann-consult.de)
- About Calvalus (brockmann-consult.de)
By the way, I don’t use the @marpet account anymore (see Farewell & Welcome SNAP Community) and I don’t visit this forum as often. You can use the EOMasters Forum if you have a question for me.