By Mark Mayo;
How to Scale
- Vertically (db)
- Horizontal (page generation) – stateless page + segregated inserts
- Agile Infrastructure + Dev – Optimization takes priority over features as soon as app goes viral. Users arrive fast and furious
Specifics
Example of “Are you normal” by Kinzin
- They had their own infrastructure from independent website
- 1sst facebook app
- but used joyent
- Traffic: 150k yesterday, 200k today
What they did in the app
- think about reengagement
- First 50k users are most difficult. Advertised to get those users
- got to recently popular page. Got peaks when they appear on recently popular pag
Their Story
Started Small
- started with $15 shared hosting
- chose $45 accelerator
- 2x125 (1GB) for launch
- preconfigured and tested load balancing
First Recently popular page
- 10K users
- db was 100% cpu
- not enough mongrels to handle db connections
- what they did
- split and clone stateless app server container
- double database memory
- tripled performance in 2 h
Its always database
- look for slow queries (obvious but overlooked, untested)
- find offending code, hand optimize sql (do it)
- memcache everything (no other option)
- run a memcached per app server
- most apps don’t need to go to multiple db (very expensive option)
Second recently popular
- 50k users
- much better caching
- just one slow query
- added 2 more app servers (4x now)
- db lagging on I/O now
Recently popular #3
- already dedicated disk spindles for data and logs
- 100k users
- no problems, db cpu under 15%
What happened: went totally viral in 2 weeks. Very little time if your app goes viral. Have a strategy.
Next Steps
- mysql replica
- split read/write queries in code
- add appservers as needed
- metrics indicate another 3-4 app servers to reach 1M with capacity to spare
Lessons learnt
- you only get hours on recently popular page
- must have plan to add capacity on fly in tens of minutes
- plan on how to attack optimization in
- test with more than sample data to find those slow queries.. its always db
Q&A
- to load test.. write script to add users
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