Your question is Design a Distributed Key-Value Store. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Design a distributed key-value store and explain the tradeoffs in your implementation.
Clarify the API, consistency model, partitioning strategy, replication, failure handling, storage engine, and operational requirements. Explain how your design would support low-latency feature retrieval for ML serving if relevant.