Stats

500 million page views a day

15B  page views month

~20 engineers

Peak rate of ~40k requests per second

1  TB/day into Hadoop clusterxx

Many TB/day into MySQL/HBase/Redis/Memcache

Growing at 30% a month

~1000 hardware nodes in production

Billions of page visits per month per engineer

Posts are about 50GB a day. Follower list updates are about 2.7TB a day.

Dashboard runs at a million writes a second, 50K reads a second, and it is growing.

Software

OS X for development, Linux (CentOS, Scientific) in production

Apache

PHP, Scala, Ruby

Redis, HBase, MySQL

Varnish, HA-Proxy, nginx,

Memcache, Gearman, Kafka, Kestrel, Finagle

Thrift, HTTP

Func - a secure, scriptable remote control framework and API

Git, Capistrano, Puppet, Jenkins

Test website responsiveness