alt Hacker NewsRedis has some pretty useful primitive that many languages don't:
- HyperLogLog, bloom filter, other probabilistic data structures
- Geospatial operations on stored points and polygons
- Expiring keys, for creating caches
These aren't in most standard libraries, and the Redis implementations tend to be fast, robust and well understood.
Can you name a single language that can talk to redis and doesn't have these in a form of a library that integrates with an app better than mystical embedded redis?
Every language you can talk to redis most likely has a library to do that, and it probably works much better with the rest of application than "embedded redis". If it doesn't, it probably has C-FFI and there is "fast, robust and well understood" implementations in C.