Webinar Slides: Intelligent Database Proxies: Routing & Transparent Failover
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This webinar by our proxies guru, Gilles Reyrat, is the second installment of our database proxies webinar series and follows ‘Introduction to Database Proxies’. This second session looks at two breeds of proxies: the “fast & simple proxy” (aka 4 layer proxy) and the “intelligent proxy”; and takes a closer look at transparent failover as well as read-write splitting. AGENDA - Recap: Introduction to Database Proxies - Two Breeds of Proxies - The Fast & Simple Proxy (4 Layer Proxy) - The Intelligent Proxy - Transparent Failover - Connection / Failure / Failover / Reconnection - Read-Write Splitting - 4 Layer Proxies R/W Split - With Intelligent Proxies - SQL Parsing / Application Driven / Smart Scale PRESENTER Gilles Rayrat - VP of Engineering, Continuent - has over 20 years experience in software engineering. Previously holding positions at Orange and Xerox, he joined the Continuent adventure in 2005. As the connectivity expert at Continuent, he has worn many hats including software development, QA, support, project and operations management. Gilles has held most of the engineering positions that he now manages, giving him both deep and wide experience.
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Webinar Slides: Intelligent Database Proxies: Routing & Transparent Failover
- 1. The MySQL Availability Company INTELLIGENT DATABASE PROXIES Routing and transparent failover Gilles Rayrat
- 2. About the Presenter Gilles Rayrat VP of Engineering Co-author and main developer of the Tungsten Proxy
- 3. IN THE LAST EPISODE…
- 4. Recap Proxies make clusters appear as simple Databases to applications Application Proxy
- 5. Recap Proxies make clusters appear as simple Databases to applications Even in complex topologies Application Proxy
- 6. Recap Proxies make clusters appear as simple Databases to applications Even in complex topologies With read scaling optimizations Application Proxy
- 7. 2 BREEDS OF PROXIES
- 8. 2 BREEDS OF PROXIES: SIMPLE
- 9. The fast and simple Application Proxy
- 10. The fast and simple Application Proxy Connects to a single node
- 11. The fast and simple aka. layer 4 proxy Application Proxy Connects to a single node Can route to replicas, pick at connection time
- 12. The fast and simple aka. layer 4 proxy Application Proxy Connects to a single node Can route to replicas, pick at connection time Fast & Transparent
- 13. The fast and simple aka. layer 4 proxy Application Proxy Connects to a single node Can route to replicas, pick at connection time Fast & Transparent Broken node = broken connection
- 14. The fast and simple aka. layer 4 proxy Application Proxy Some players: • HA proxy • Nginx • Envoy • F5 • ELB
- 15. The fast and simple aka. layer 4 proxy Application Tungsten Proxy Some players: • HA proxy • Nginx • Envoy • F5 • ELB • Tungsten Proxy Tungsten Cluster
- 16. 2 BREEDS OF PROXIES: INTELLIGENT
- 17. The intelligent proxy Application Proxy ”Real” connection to the proxy Wire protocol understood
- 18. The intelligent proxy Application Proxy ”Real” connection to the proxy Wire protocol understood Even at connection time
- 19. The intelligent proxy Application Proxy ”Real” connection to the proxy Wire protocol understood Even at connection time Automatic or app-driven load balancing
- 20. The intelligent proxy Application Proxy ”Real” connection to the proxy Wire protocol understood Even at connection time Automatic or app-driven load balancing Transparent failover
- 21. The intelligent proxy Application Proxy Some players: • ProxySQL • Maxscale • MySQL router • Tungsten Proxy
- 23. Connection to a proxy Application Tungsten Proxy application <> proxy connection proxy <> database connection
- 24. Failure Application Tungsten Proxy application <> proxy proxy <> database connection BROKEN
- 25. Failure Application Tungsten Proxy application <> proxy connection OK proxy <> database connection BROKEN
- 26. Failover Application Tungsten Proxy application <> proxy: Traffic is paused proxy <> database: automatic reconnection (Manager)
- 27. Reconnection Application Tungsten Proxy application <> proxy: traffic resumed proxy <> database: fresh connection
- 29. READ-WRITE SPLITTING • Layer 4 proxies r/w split • With intelligent proxies • SQL parsing • Application driven • Smart scale
- 30. With a layer 4 proxy Application Proxy Single node picked per connection
- 31. Port based Application Proxy Target PORT on the proxy determines the connection type 33063307
- 32. Host based Application Proxy Target HOST reroutes to the desired node127.0.0.1127.0.0.2
- 33. READ-WRITE SPLITTING • Layer 4 proxies r/w split • With intelligent proxies • SQL parsing • Application driven • Smart scale
- 34. R/W splitting with an intelligent proxy Application Tungsten Proxy 3307 3306 Port and Host based r/w split also available
- 35. READ-WRITE SPLITTING • Layer 4 proxies r/w split • With intelligent proxies • SQL parsing • Application driven • Smart scale
- 36. Automatic R/W splitting Application Tungsten Proxy Automated SQL analysis SELECTSHOW
- 37. Automatic R/W splitting Application Tungsten Proxy Transactions remain on master BEGIN… COMMIT
- 38. READ-WRITE SPLITTING • Layer 4 proxies r/w split • With intelligent proxies • SQL parsing • Application driven • Smart scale
- 39. Application-driven R/W splitting Application Tungsten Proxy Directives given through SQL comments TUNGSTEN USE RO_RELAXED
- 40. Application-driven R/W splitting Application Tungsten Proxy Directives given through SQL comments • For a single statement TUNGSTEN USE RO_RELAXED /* TUNGSTEN USE RO_RELAXED */ SELECT xxx
- 41. Application-driven R/W splitting Application Tungsten Proxy Directives given through SQL comments • For a single statement • For a block TUNGSTEN USE RO_RELAXED /* TUNGSTEN USE RO_RELAXED */ SELECT xxx -- TUNGSTEN USE RO_RELAXED SELECT xxx SELECT yyy
- 42. READ-WRITE SPLITTING • Layer 4 proxies r/w split • With intelligent proxies • SQL parsing • Application driven • Smart scale
- 43. Smart Scale Application Tungsten Proxy Avoids reading stale data by recording write positionWrite position N
- 44. Smart Scale Application Tungsten Proxy Avoids reading stale data by recording write position Reads from slave only if last write has reached the replica Write position N Is Write N replicated?
- 45. Smart Scale Application Tungsten Proxy Avoids reading stale data by recording write position Reads from slave only if last write has reached the replica Otherwise reads from primary Write position N Until replicas catch up
- 46. RECAP
- 47. Fast and simple proxy Application Proxy
- 50. Read from replicas Application Tungsten Proxy Many read/write splitting possibilities Write position N Is Write N replicated?
- 51. For More Info… Product and General Information: info@continuent.com Sales Requests: sales@continuent.com
- 52. THANK YOU FOR LISTENING continuent.com The MySQL Availability Company Gilles Rayrat