1. Dropwizard at Yammer
Jamie Furness (jfurness@yammer-inc.com)

2. Once upon a time… (2010)
RabbitMQ!
(3 nodes)!
PostgreSQL

3. Birth of Dropwizard (2011)
PostgreSQL
3 Services
Jetty!
Jersey!
Jackson!
Metrics!
Guava!
Logback!
=!0.0.1-SNAPSHOT!

4. Current (2014)
PostgreSQL
30+ Services (170+ nodes)
0.6.2!
4+ Services (10+ nodes)

5. Message Feeds
Postgres
Cassandra
Berkley DB
Berkley DB
Memcache

6. • Physical hardware.
• At least 2 nodes per service, for HA and zero
downtime deploys.
• In house deployment service, built using
Dropwizard.
Deployment

8. • Check MK, PagerDuty
• Polling /healthcheck
• Ganglia
• Polling /metrics
• Load balancers
• Polling /ping
• Hystrix
• Tenacity
• Breakerbox
Monitoring, Metrics, Visibility

9. Feedie – GET req/sec! Artie - # connections!
Whoville – POST req/sec! Backups – bytes/sec!

10. Tenacity = Dropwizard + Hystrix

11. • Testing (dropwizard-testing-integration)
• Dependencies (Guava 16, Dropwizard 0.7.0)
• Visibility (Dapper, Tenacity)
Challenges

13. Questions?