Redis
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Redis is an advanced key-value store that supports additional data types like lists, sets, sorted sets, and hashes. It offers features like persistence, replication, atomic operations, and high performance - often handling over 100,000 operations per second. While simple like memcached, it adds additional commands, data types, and persistence. Common uses include caching, sessions, pub/sub, and building unique applications and services.
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Redis
- 1. Redis
- 2. Redis is... an “advanced key- value store ”
- 3. NoSQL? An informal, loosely-defined term for non-relational, structured data storage systems like mongodb, couchdb, memcached and redis
- 4. memcached The canonically simple example a networked “hash in the sky” behind a simple protocol Values page:index.html <html><head>[...] user:123:session xDrSdEwd4dSlZkEkj login_count “7464” user:100:last_login_time “102736485756” Everything’s a string (or a “blob”) Commands just set or get data (mostly)
- 5. Take memcached’s simplicity, Add more data types, Add persistence, Add more commands, .. and more Redis
- 6. Redis Data Types Strings Lists Sets Sorted/Scored sets Hashes all accessed by a string key
- 7. Redis Data Examples Keys Values Page:index.html <html><head>[..]String Login_count 3121 Users_logged_in_today {1,2,3,4,5}Set Latest_post_ids *201,204,209,…+list User:123:session Time=>1092313 hash Username=>arild Users_and_ratings biobot~ 1.3483 sorted (scored) set blast~ 93.4 ahriman~ 283.22 blabla~ 23774.17
- 9. Strings
- 10. Expiration
- 11. Deleting keys
- 12. Lists
- 13. Lists
- 14. Queues
- 15. Sets
- 16. Sets
- 17. Sorted sets? Sorry – no time Basically like normal sets but each element can have a “rank” or “score” and be returned or sorted by it
- 18. Hashes
- 19. Session storage
- 20. Redis Social Network Users have names, can follow others, can be followed Posts are things like messages, photos, etc
- 23. Building a unique names with colons like user:1:name Is just a convention any string win do…
- 30. A Simple Social Network
- 31. Unique IDs
- 32. Creating new user Creating new post
- 33. Enough commands! I haven't covered them all though…. On to the soft issues….
- 34. Atomicity Redis is single threaded No locking necessary In other words, commands like INCR won’t tread on each other’s toes coming from multiple clients simultaneously!
- 35. Replication • supports master-slave replication • a single-rooted replication tree • a slave may be a master to another slave
- 36. Redis Factoids BSD licensed (free, open) Sponsored by Vmware Written in ANSI C Good community (list, IRC & wiki) Works on all POSIX-complaint UNIXes
- 37. Performance Depends a lot on configuration and operation complexity. Common range from 5000 to120,000 rps for basic ops. GET/SET/LPUSH/LPOP, etc. (ultra low end to high end hardware) comparison with other no-sql implementations http://kkovacs.eu/cassandra-vs-mongodb-vs-couchdb-vs-redis
- 38. Persistence Dump data to disk after certain conditions are met. Or manually. SAVE and BGSAVE commands AND/OR An append only log file (which can be optimized/rebuid automatically) but needed to set this up in a config file
- 39. Language Support Ruby, Python, PHP, Erlang,Tcl, Perl, Lua, Java, Scala,Clojure, C#, C/C++,JavaScript/Node.js, Haskell,IO, Go
- 40. Missed a lot, now where? Google “redis” for the great official site http://www.redis.io