Ordasity could certainly be used in building distributed JRuby applications. However, I'm not sure that pairing it with Rails would be the best use case.

Ordasity is designed for building stateful distributed services -- e.g., systems which can be described in terms of individual nodes serving a partition or shard of a cluster’s total load. Rails applications tend to follow a stateless model in which any application server could serve any request.

Ordasity is more appropriate for building services in which a specific node will be serving all [requests / queries / events] for a work unit in the cluster. In our case, that's our netflow aggregation systems (which pull data together from a network of edge nodes into a single Kafka stream), and our event stream processing system (which we shard by client). In this example, we have two Ordasity clusters -- one comprised of Kafka nodes, and a second containing our event stream processing tier. Ordasity handles work distribution across both tiers, ensures that both clusters are aware of each other and able to communicate, and helps us guarantee that everything is wired up properly (i.e., each node on each tier is communicating with the proper node on another tier) when data is passed between them.

In short -- yes, you could build a distributed service in JRuby (or Clojure, Mirah, Scala, Java, etc.) with Ordasity. Just wanted to offer that note to clarify use cases.