![Questions
• @dacort
• damon [at] untitledstartup.com](https://image.slidesharecdn.com/redis-101112130616-phpapp01/85/Redis-28-320.jpg)
Redis
- 1. Redis Damon Cortesi (@dacort) Untitled Startup (RowFeeder)
- 2. Movember • Help support prostate cancer research • http://bit.ly/mo_dacort
- 3. Up and Running • wget http://redis.googlecode.com/files/ redis-2.0.4.tar.gz • tar xzvf redis-2.0.4.tar.gz • cd redis-2.0.4 • make • ./redis-server
- 4. Yes...that’s it • Redis in your browser • http://try.redis-db.com • http://code.google.com/p/redis/wiki/ CommandReference
- 6. 101 • Key/Value Store on Steroids • memcache? • Persistent • Push/Pop • Data types • Fast - 110000 SETs/sec, 81000 GETs/sec
- 7. Redis Data Types • Strings • Lists • Sets • Sorted/Scored Sets • Hashes
- 8. But wait, there’s more! • Clustering • Replication • Master/Slave • Publish/Subscribe
- 9. Use Cases • Queue Processing • Set Intersection • Stats Tracking/Leaderboards
- 10. Keyword Filter Geo Filter Other Custom Filters Resque Queue (redis) Resque Workers MongoDB Status Storage External Data Tagging - bit.ly, geo, klout rowfeeder.com MySQL User & Track Data Slave MySQL Geo Lookups Memcache Web Status Processing Google Spreadsheet
- 11. Queues • Resque - Killer Ruby library for background jobs • RowFeeder - 428,811,359 items processed a b c d LPOP RPUSH
- 14. Set Intersections • Goal: Contact Ashton Kutcher on Twitter • Approach: Is there anybody I can DM that can DM Ashton, or a friend of his?
- 15. Step 1 • Are any of my followers his friends? • SADD - Add specified member to the set • SINTER - Intersection of N sets
- 17. Step 2 • Can I DM somebody that can DM a friend of his? • ?t ?
- 19. Sweet!
- 20. Scoreboards • Sorted ZSets • ZINCRBY - Increment Operator • ZRANGE - Sort + Subset
- 21. • Tracks Twitter/Facebook Posts • ~4,000 keywords monitored in real-time • ~2MM posts/day • Sometimes...
- 23. Step 1 • Maintain counters of all matched terms • Increment the “stream::kw::time” key by 1
- 24. Step 2 • 5 minute running average of the top 10 terms
- 27. Limitations • Greedy with memory • If it grows to XGB...it will stay there • (Not optimal if a queue backs up) • All in RAM / Atomicity • 2.0 solves both of these! • NoSQL
- 28. Questions • @dacort • damon [at] untitledstartup.com