What the hell is your software doing at runtime?
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Slides from my presentation at Better Software 2015. Code generates business value when it runs not when we write it. We must know how our code perform at runtime, how it interacts with the infrastructure, how our customers are using it to give them the opportunity to give use more money. Set SLAs, measure them, reach them and move forward to increase the business value of our software.
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What the hell is your software doing at runtime?
- 1. { } { } { } Firenze, November 17th 2015 Roberto “FRANK” Franchini @robfrankie Increase business value, measure it! What the hell is your software doing at runtime?
- 2. More than 15 years of experience, proud to be a programmer Member of OrientDB team, tech lead for the full-text, spatial, JDBC and Docker images Wrote software for NLP and opinion mining (@scale ) Played with servers, then bought a sysadmin JUG-Torino co-lead 2 whoami(1)
- 3. Agenda Quotes System monitoring Coding Application monitoring All together Feedback Sample Scenario 3
- 4. { } { } { } Quotes
- 5. Business value Our code generates business value when it runs, not when we write it. We need to know what our code does when it runs. We can’t do this unless we measure it. (Codahale) 5
- 6. SLA driven Have an SLA for your service Measure and report performance against the SLA (Ben Treynor, Google inc.) 6
- 7. { } { } { } System monitoring
- 8. Infrastructure monitoring Sysadmins monitor infrastructure from the beginning of IT With right tools a single BOFH can handle hundreds of servers 8
- 9. Tools On premises collectd zabbix zenoss nagios cacti graphite/grafana Cloud based datadog newrelic 9
- 10. Measures Cpu load Network traffic Disk I/O Memory More and more 10
- 11. Charts 11
- 12. Dashboard 12
- 14. { } { } { } Code and deploy
- 15. Write TDD SOLID principles Design Patterns Code metrics 15
- 16. Build unit tests integration tests performance tests test coverage code quality reports 16
- 18. Rest All done, take your rest Umh I don’t think so anymore 18
- 19. { } { } { } Application monitoring
- 20. The day after deployment How to monitor our service status? How to measure it? How it behave? How it interact with other parts of the system? Multiply for each µ-service 20
- 21. Monitorability Design sw to be monitorable Expose metrics (JMX) Expose status (REST api) Send metrics to monitoring tools 21
- 22. We need application monitoring “Application monitoring? WHAT?” “Ok, let me explain What the app is doing right now? How is the app performing right now? And then graph it!” “Ok, I got it!” “Let me see” 22
- 23. 5 minutes later public class PoorManJavaMetrics { int called; long totalTime; public void doThings() { final long start = System.currentTimeMillis(); //heavy business logic called++; final long end = System.currentTimeMillis(); final long duration = end - start; totalTime +=duration; } public void logStats() { System.out.println("---stats---"); //Here be DRAGONS } } 23
- 25. Use the right tool Use a library (e.g.: dropwizard metrics) Count events, measure duration Log metric values Send application metrics to the same backend of system metrics 25
- 26. Don’t forget naming! A naming pattern <namespace>.<instrumented section> .<target (noun)>.<action (past tense verb)> Such as accounts.authentication.password.failed Use prefix prod, test, dev, local prod.accounts.authentication.password.failed 26
- 27. Which metrics? Rate of documents processed Latency Transactions per second (€€€€) Total number of errors Meantime user interaction 27
- 28. { } { } { } All together now
- 29. Code on systems Don’t cross the streams Enable code metrics means sysadmins and devs in the same room talking to each other to improve business value 29
- 30. Send application metrics to the same backend of system metrics 30
- 33. Correlate application and system metrics (Cross the streams!) 33
- 35. To do what? Discover bottlenecks post-mortem analysis SLA monitoring IO impact Network traffic Memory utilization 35
- 36. To do what? Why is performing better on dev laptop? Why on customer infrastructure it takes 24h (our old test server takes 1h)? Mechanical sympathy at large: the new service is fucking up the I/O 36
- 37. Implement THE User Story Given the application running when the manager comes then I want to show a big green number 37
- 38. The answer 42 38
- 40. Get feedback 40 It’s all about feedback Our code is talking to us Listen to it And take decisions
- 41. Decisions Set new SLAs Refactor bottleneck Buy new hw Expand the cloud Drop a product 41
- 42. 42 write code deploy it measure it get feedback
- 43. Iterative 10 define some metrics 20 deploy 30 add other metrics 40 goto 10 Are you able to deploy every day? 43
- 44. { } { } { } Sample scenario
- 45. 45 bare metal servers Ngnix, Jetty, PostgreSQL GlusterFS, Queues, Redis, Jenkins (cron on steroids) Infrastructure 45
- 46. Software Java shop deploy with Docker More than 120 webapps More than 100 batch jobs NRT stream processing jobs running 24x7 46
- 47. Monitoring collectD, graphite, grafana for system monitoring Dropwizard Metrics inside code for application monitoring Application metrics reported to graphite too 47
- 48. Feedback and decisions WTF happened last night? How is it going this morning? Do you think we can survive the message flood? Hey boss, it’s time to buy a new server, we are running out of resources. 48
- 49. { } { } { } Wrap up
- 50. Shopping list Define your SLAs/target Code and deploy with good practices Code with monitorability in mind Monitor your app/service Correlate system and application metrics Get feedback Take decisions 50
- 52. Credits Sketches by my sons Andrea (Andrew) and Luca (Luke) Franchini Cool dashboards are made with Grafana 52
- 53. { } { } { } Thank you Roberto Franchini ro.franchini@gmail.com r.franchini@orientdb.com @robfrankie