RAMP-TAO: Layering atomic transactions on Facebook’s online graph store

What this post added

Introduced RAMP-TAO, a new protocol that layers atomic transaction guarantees on top of TAO, Facebook's online social graph store. RAMP-TAO addresses the challenge of providing transactional semantics over an eventually consistent, massive-scale data store by focusing on guarding against fractured reads for recently updated data, minimizing performance and storage overheads for existing non-transactional workloads. It achieves over 99.9 percent of reads completing in one round-trip to the local cache with tail latency on par with existing TAO reads, incurring overhead only for opt-in applications.