Link post

http://highscalability.com/blog/2013/8/28/sean-hulls-20-biggest-bottlenecks-that-reduce-and-slow-down.html

This article is a lightly edited version of 20 Obstacles to Scalability by Sean Hull ( with ...

A great article enumerating the biggest bottenecks thar impact scalability:

1. 2-phase commit
2. Insufficient or no caching
3. Bad Disks, Raid 5, Multitenant storage
4. Serial processing
5. Missing feature flags (enable/disable features)
6. Single copy of database
7. Using database for queuing
8. Using database for full-text searching
9. Object Relational Mappers (ORMs)
10. Missing instrumentation
11. Not using a version control system
12. Single points of faillure
13. Lack of browse-only mode
14. Weak communication between team members
15. Lack of documentation
16. Lack of fire drills
17. Insufficient monitoring and metrics
18. Cowboy operations
19. Growing technical debt
20. Insufficiente Logging