Scale Fail: How I Learned to Love the Downtime
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This document provides tongue-in-cheek advice about embracing downtime and failures in software systems. It suggests that focusing too much on prevention leads to over-engineering, while acknowledging historical failures can guide solutions. It also contrasts traditional monolithic architectures with newer distributed designs that are complex but allow independent scaling of components. The overall message is that failures happen and simplicity is more important than perfection.
Scale Fail: How I Learned to Love the Downtime
- 1. Scale Fail or, how I learned to stop worrying and love the downtime
- 4. Downtime is Sexy
- 5. 1. Be Trendy
- 8. NO Resource Monitoring Performance Testing Traffic Monitoring Load Testing Tuning Analysis
- 9. Let History Be Your Guide ● Was database to slow last time? ● The database is too slow this time. ● Did the network cards fry last time? ● They're frying this time. ● Did Apache choke on memory leaks last time? ● It's Apache this time. ● Fixed things by using queues at your last job? ● Then fix them with queues at this job!
- 11. Parallel Programming XY SE OT N
- 12. Don't Worry About It Program- X Y ming SE
- 13. How to Single-Thread Your Code ● Locks, Locks, Locks! ● Ignore scope and memory address space ● Frequently-updated single-row table ● Master Control Server process ● Single Master Queue ● Blocking threads which wait while checking on a remote data source
- 14. The Old Way: Caching Connection Caching Pool App Web Server Server App Web Object Cache DB HTTP Cache Data Cache Server Server App Web Server Server
- 15. The New Way: Direct2DB Web Server Web DB HTTP Cache Server Web Server
- 16. Easy to Scale ● Web servers ● Caches ● Shared-nothing hosts ● Simple App Servers For Wimps!
- 17. Hard to Scale ● Databases ● Queues ● Shared Filesystems ● Web Frameworks For Real Developers!
- 18. SPoF
- 19. Single Point of Failure App Web Server Server UserDB Task App Load Web Load Manager Server Balancer Server Balancer PageDB App Web Server Server
- 20. Cascading Failure Web Server UserDB Task App Load Web Load Manager Server Balancer Server Balancer PageDB App Web Server Server