Redis - An Introduction
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This talk gives an introduction into what Redis is, what you can do with it and why it is cool.
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Redis - An Introduction
- 1. Redis Thorsten Böttger Sharesight.co.nz WellRailed 23/05/2012 http://www.flickr.com/photos/linecon0/1085617988
- 5. key-value store http://www.flickr.com/photos/jamesclay/2312912612/
- 7. no document database http://www.flickr.com/photos/linneberg/4481309196/
- 8. no relational database http://www.flickr.com/photos/lencioni/203030529/
- 9. Salvatore Sanfilippo Pieter Noordhuis
- 10. Open Source
- 11. design principle “I see Redis definitely more as a flexible tool than as a solution specialized to solve a specific problem.” — Salvatore Sanfilippo
- 12. Characteristics http://www.flickr.com/photos/gjw/487364375/
- 14. Craftmanship http://www.flickr.com/photos/gte491n/4335439637/
- 16. Love Not like this guy... http://www.flickr.com/photos/brettmorrison/4718717523/
- 17. Alive and kicking +
- 18. Well documented
- 19. Easy to install
- 20. Easy to configure http://www.flickr.com/photos/mag3737/3176598270/
- 21. XML
- 22. plain text # By default Redis does not run as a daemon. Use 'yes' if you need it. # Note that Redis will write a pid file in /var/run/redis.pid when daemonized. daemonize no # When running daemonized, Redis writes a pid file in /var/run/redis.pid by # default. You can specify a custom pid file location here. pidfile /var/run/redis.pid # Accept connections on the specified port, default is 6379. # If port 0 is specified Redis will not listen on a TCP socket. port 6379 # If you want you can bind a single interface, if the bind option is not # specified all the interfaces will listen for incoming connections. # # bind 127.0.0.1 # Specify the path for the unix socket that will be used to listen for # incoming connections. There is no default, so Redis will not listen # on a unix socket when not specified. # # unixsocket /tmp/redis.sock # unixsocketperm 755 # Close the connection after a client is idle for N seconds (0 to disable) timeout 0 # Set server verbosity to 'debug' # it can be one of: # debug (a lot of information, useful for development/testing) # verbose (many rarely useful info, but not a mess like the debug level) # notice (moderately verbose, what you want in production probably) # warning (only very important / critical messages are logged) loglevel notice
- 23. or on-the-fly $ redis-cli CONFIG SET loglevel debug
- 25. Administration
- 26. Replication Master Slave Slave Slave Slave Slave
- 27. Persistence Redis Data Backup Redis Redis Redis Redis Redis time
- 28. Persistence Append-Only File Redis ∂ ∂ ∂ ∂ time
- 29. Security
- 31. Cache Store https://github.com/jodosha/redis-store Session Store https://github.com/mattmatt/redis-session-store Counters stats, API requests per hour, DoS, Spam
- 32. Url Shortener Redis string a6hz89z: https://mysite/ a/very/deep/ link? with=params
- 33. Wizards Redis Form Step 1 hash a: ‘name’ b: ‘email’ Form Step 2 after 3rd step intermediate results ... DB k: ... Form Step 3
- 34. Map-Reduce Redis hash Worker sums[a] Map { Worker sums[b] sums[c] } Reduce Worker
- 35. Job Queue Redis list Rails App Push now 1.hour.ago ... 2.hours.ago Pop Worker Resque https://github.com/defunkt/resque Sidekiq https://github.com/mperham/sidekiq
- 36. Unique Visitors Redis set user A user K user Y
- 37. List of online users Redis set ⌚ user A ⌚ user K ⌚ user Y
- 38. Todo lists Redis sorted set 1. this 2. that 3. ...
- 39. Leaderboard Redis sorted set 7. top 3. middle 1. loser
- 40. Push Notifications Redis Event pubsub channel A Event Publish channel B Pusher Subscribe ... Event
- 41. Chat system Redis pubsub Publish channel A Subscribe Subscribe Publish user A channel B user B
- 42. Communication between Apps Redis pubsub Rails Publish channel A Subscribe Any Subscribe Publish other channel B
- 43. Activity Feed Redis action list } A wrote B is following display A added LTRIM A wrote
- 44. Activity Feed 2 where every user shows up only once Redis action sorted set hash t3: A A: ‘A wrote’ t2: B B: ‘B is following’ t1: C C: ‘C added’
- 45. Tagging Redis hash hash hash book_1 book_2 book_2 name: ... name: ... name: ... author: ... author: ... author: ... set set tag:redis tag:rails 1 2 3
- 47. Limits & drawbacks http://www.flickr.com/photos/36117591@N04/3558894634/
- 48. Big Data
- 49. Scalability
- 50. To the rescue: Clustering Master Master Master consistent Master Master hashing Master Master Master
- 51. It’s not a Database
- 52. Not Exchangeable
- 55. Thank you! Thorsten Böttger @enebo http://mt7.de http://www.flickr.com/photos/analogian/5913840143/ http://Sharesight.co.nz
Editor's Notes
- Kiwi accent, still lose me on the phone\n#bedrooms instead of square meters\nThanks, Driver!\n
- Salvatore Sanfilippo, Pieter Noordhuis, Paul Maritz, Jose Valim, DHH\nthey have something in common\n
- \n
- \n
- NoSQL, REmote DIctionary Server, written in C, single-threaded, all data in memory\n\n...like memcached\n
- advanced data structures\npersistence\n
- supports advanced data structures\nbut not THAT advanced \n
- set-based queries, but not with that highly sophisticated selects or joins or type-supporting\n
- 10.4.2009 initial release\n
- Paul Maritz, CEO vmware\n
- \n
- \n
- how fast is fast? (> 100,000 SETs per second)\n
- following and respecting the Big O notation (describe limiting behaviour, and classify algorithms)\n
- \n
- maintainers care and are very responsive\n
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- brew install redis, apt packages, standard make\nport 6379\n- no major dependencies\n
- \n
- just kidding\n
- with lots of comments\n
- \n
- lots of clients (redis-rb, hiredis-rb, em-redis)\nnerdy DSL, but follows a logic\nCONSOLE!!!\nhttp://try.redis-db.com/\n
- \n
- slaves are read-only by default\nnon-blocking for master (logging incoming commands)\nnon-blocking for slaves (just a short switch-over)\n\n
- Redis Data Backup (+easier to backup, +fast recover, -may lose data, -fork() slow for bigdata)\nsave 900 1\nsave 300 10\nsave 60 10000\n
- Append-Only File (+readable, +faster to write, -bigger file, maybe slower if writing too often)\nrun both!\n
- Redis is designed to be accessed by trusted clients inside trusted environments\n-> bind to local address\n-> Auth is possible\n-> strings are not escaped in any way\n-> rename certain commands\n\n
- \n
- \n
- based on Redis strings\nuseful for permanent links or when urls get too long\nor to obsfuscate urls\n\n
- based on Redis hashes\n
- based on Redis hashes\n\n\n
- based on Redis lists (FIFO)\n
- based on Redis sets\n\n\n
- based on Redis sets with expire\n\n\n
- based on Redis sorted sets\nwhere you update a lot of items at once\n\n
- based on Redis sorted sets\nwhere you update a lot of items at once\n\n
- based on Redis pubsub\n
- based on Redis pubsub\n\n
- based on Redis pubsub\n\n
- based on Redis lists\nLTRIM makes sure the list doesn’t get longer\n\n\n
- based on Redis sorted set, in combi with a Hash\n\n\n\n
- in combination with sort\n\n\n
- \n
- \n
- kept in memory\n100M entries => 16GB RAM\n
- not seamless\n- short blockings when syncing with slaves\n- just one master\n
- every node has some portion of the data\n- native cluster is in the works\n- redis-rb simulates this\n
- don’t try to treat it that way, it’s not a replacement\n- data structures not flexible enough\n- queries not detailed enough\n
- DSL is unique\n
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