The way we provide the LDF service is not scalable (T161240) and overtime our fork of LinkedDataFragments/Server.Java has diverged from upstream.
LinkedDataFragments/Server.js seems more active than LinkedDataFragments/Server.Java and seems to provide an external layer that can work on top of a sparql service. This could hopefully fix our scalability issue and address the tech debt of having to maintain our own fork of LinkedDataFragments/Server.Java.
The WMCS machine ldf-test.wmflabs has been created for this purpose.