Release Often Release Safely

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Release Often Release Safely<br />Sergejus Barinovas (@sergejusb)<br />http://sergejus.blogas.lt<br />

This is not a theoretical presentation<br />

This presentation based on real life experience<br />

Successful software workflow<br />

Dilemma: Innovative or Stable?<br />Innovative<br />Often (bi-weekly) releases of new features<br />Higher risk of bugs an...

We wanted both …<br />… be innovative and agile while staying as much stable as possible<br />

Stability in our terms<br />99.999% uptime for serving ads<br />2 datacenters + clouds<br />500 M requests / day<br />

Let’s learn Kung Fuof releasing often and safely<br />

Challenges we ha(d/ve)<br />Detect issues in production as soon as possible<br />Test new features in production while red...

Detect issues in production ASAP<br />Monitoring<br />Choose monitoring system carefully<br />It took us about 1 year (Zab...

Detect issues in production ASAP<br />Automated functional tests<br />Designed to detect end-user issues<br />Differently ...

Though unit tests help in finding bugs during coding, they are more vital when software evolves!<br />Finding<br />

Test new features in production<br />Even ideal staging environment is not equal to production environment<br />Before sta...

Test new features in production<br />Use Case #1:<br />Safely rollout new feature that integrates into core data collectio...

Test new features in production<br />Dark release notes from our release plan<br />

Test new features in production<br />Use Case #2:<br />Safely migrate to the new SQL connection pooling mechanism<br />

Test new features in production<br />Valves<br />Very similar to switches<br />Feature can get from 0% to 100% of real loa...

Test new features in production<br />Caveats we had so far<br />Make sure you can turn features on / off without effecting...

Controlling roll-out of new feature<br />Switches and valves enable very smooth and controlled roll-out<br />Partial roll-...

Controlling roll-out of new feature<br />Future research: application level load balancing<br />Load balancer can act as a...

Summary<br />Monitoring system is very important, but your software should be prepared for this<br />Automated functional ...

Thanks! Questions?<br />Sergejus Barinovas (@sergejusb)<br />http://sergejus.blogas.lt<br />

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