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Could anyone explain a use case for this? (Distributed KV store)

Genuine question, thanks

I would imagine instances where you'd use memcached.

Session storage could be one use-case. Another could be caching DB query results for a specified amount of time (1 min, 5 min, etc).

In-memory data lookup

Relational and Non-relational database speedup

Managing spikes in web/mobile apps

Session-store

Token caching

Gaming - Player profiles & leaderboards

Web page caching

Global ID or counter generation

Fast access to any suitable data