Comment by comcast-jonm

Our particular reference dataset (TV and movie data) had some application use cases that required custom data structures to get the in-memory performance we wanted. Sirius doesn't provide datastructures per se (and isn't really even a datastore itself)--it provides an eventually-consistent, replicated update stream that you can use to maintain your own datastructures. Having that developer freedom and control over the datastructures was an important design principle.