Matt Lee, Network Engineer at Twitter, presents on the geography of tweets and how Twitter operates their global Anycast content delivery networks (CDNs).

1. O P E R A T I N G G L O B A L A N Y C A S T C D N ’ S
@ m a t t l 3 3
THE GEOGRAPHY OF TWEETS

2. Twitter users are mobile
D E L I V E R I N G C O N T E N T F A R A N D W I D E

4. VISIBILITY CHALLENGES IN OPS
Internal service monitoring great
Rich client side metrics
What about the CDN edge?
perspective matters

5. TROUBLEHSOOTING BEFORE THOUSANDEYES
user complaints + provider tickets
alternate monitoring services had small footprint, bad for anycast
hurry up and wait

6. WHERE’S THE DATA?
HTTP headers are your friend
Traceroute’s from 100 sources, visualized together
Is anycast tuned correctly?
Fix it faster!

7. WHAT’S NORMAL?

8. WHAT?

9. WELL, CRAP
Why is Moscow going through Tokyo???

10. ADDITIONAL EXAMPLES
“The internet isn’t working” won’t cut it
Which cache served up the request?
Methods of reducing MTTR

11. ADDITIONAL EXAMPLES
Methods of reducing MTTR

12. @ m a t t l 3 3
T H A N K S