Scaling Quizlet

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Quizlet

Tecnología

Quizlet.com
We provide educational tools for millions of kids.

Friday, April 20, 12

Trafﬁc
• 70M pageviews/mo

• 7.5M uniques/mo

• Quantcast US Rank: #385

• 99.97% uptime this year

Friday, April 20, 12

Trafﬁc Pattern

6x growth in 4 weeks, every year
Friday, April 20, 12

Data

• 160 GB in MySQL

• 1.1B rows in `answers` table

• One big 48GB master does it all
(are we crazy?)

Friday, April 20, 12

Architecture
• 2 Load Balancers

• 3 Web Servers

• 2 Database machines

• ~15 machines doing services

Friday, April 20, 12

Throughput
Page requests:
- 750 rps peak
- 300 rps avg

Memcached: MySQL:
- 2,500 qps peak - 1,100 qps peak
- 1,000 qps avg - 465 qps avg

Friday, April 20, 12

Biggest single win
(2010)
Removing joins.

Putting all ID-based lookups in
memcached.

3x’d our performance overnight,
prevented complicated architecture
Friday, April 20, 12

$Watching syscalls with DTrace dtrace -n 'syscall::open:entry { printf("%s %s",execname,copyinstr(arg0)); }' Found PHP opening files because of require_once(). Switched to require(). Friday, April 20, 12$

Need better visibility
into apps
Site got
2x faster
here

Friday, April 20, 12

Enter New Relic
(live demo)

Friday, April 20, 12

New Relic isn’t enough.

Friday, April 20, 12

Check out our super-crappy,
super-awesome Inline I/O viewer

Friday, April 20, 12

And our super-crappy,
super-awesome App log viewer

Friday, April 20, 12

Our log viewer

Check out our super-crappy,
super-awesome Log Viewer

Friday, April 20, 12

YOUR LOGS
ARE
RELATIONAL
Friday, April 20, 12

Log lookups by

• User ID
• IP address
• Type
• Frequency
• Type+Frequency
• Response times

Friday, April 20, 12

Scalable diagnosis of
user issues with
feedback
(demo)

Friday, April 20, 12

The Future

We built a game in Node.

It rocks.

Friday, April 20, 12

Future

We built a game in Node.

It rocks.

Friday, April 20, 12

New Scaling Story

Single user might have 5 messages
with the server in 1 second.

Connection lasts 30 minutes,
not 100ms.

Friday, April 20, 12

Scaling node

We’re exploring this now.
And need help.

Friday, April 20, 12

Show Me What’s Wrong

Second coolest website ever.

http://showmewhatswrong.com/

Friday, April 20, 12

Poor man’s SMS alerts
Setup GMail filter for SMS
1. Add filter for name+sms@hotstartup.com

2. Forward to 4155551234@vtext.com (VZW)

3. Your app can now text you anytime, for free.

Friday, April 20, 12

Ambient Trafﬁc
Awareness
Get the New Relic Menu Bar
Always know about how much traffic you have.

(Available in Mac App Store)

Friday, April 20, 12

Use Vogue!

Never refresh for CSS again!

Vogue
github.com/quizlet/vogue

Friday, April 20, 12

Thanks!
Follow:
@asuth
@quizlet

Friday, April 20, 12

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Scaling Quizlet

1. Scaling Quizlet Andrew Sutherland Founder Friday, April 20, 12

2. Quizlet.com We provide educational tools for millions of kids. Friday, April 20, 12

3. Trafﬁc • 70M pageviews/mo • 7.5M uniques/mo • Quantcast US Rank: #385 • 99.97% uptime this year Friday, April 20, 12

4. Trafﬁc Pattern 6x growth in 4 weeks, every year Friday, April 20, 12

5. Data • 160 GB in MySQL • 1.1B rows in `answers` table • One big 48GB master does it all (are we crazy?) Friday, April 20, 12

6. Architecture • 2 Load Balancers • 3 Web Servers • 2 Database machines • ~15 machines doing services Friday, April 20, 12

7. Throughput Page requests: - 750 rps peak - 300 rps avg Memcached: MySQL: - 2,500 qps peak - 1,100 qps peak - 1,000 qps avg - 465 qps avg Friday, April 20, 12

8. Biggest single win (2010) Removing joins. Putting all ID-based lookups in memcached. 3x’d our performance overnight, prevented complicated architecture Friday, April 20, 12

9. Watching syscalls with DTrace dtrace -n 'syscall::open:entry { printf("%s %s",execname,copyinstr(arg0)); }' Found PHP opening files because of require_once(). Switched to require(). Friday, April 20, 12

10. Need better visibility into apps Site got 2x faster here Friday, April 20, 12

11. AVERAGES SUCK Friday, April 20, 12

12. Enter New Relic (live demo) Friday, April 20, 12

13. New Relic isn’t enough. Friday, April 20, 12

14. Check out our super-crappy, super-awesome Inline I/O viewer Friday, April 20, 12

15. And our super-crappy, super-awesome App log viewer Friday, April 20, 12

16. Our log viewer Check out our super-crappy, super-awesome Log Viewer Friday, April 20, 12

17. YOUR LOGS ARE RELATIONAL Friday, April 20, 12

18. Log lookups by • User ID • IP address • Type • Frequency • Type+Frequency • Response times Friday, April 20, 12

19. Scalable diagnosis of user issues with feedback (demo) Friday, April 20, 12

20. The Future We built a game in Node. It rocks. Friday, April 20, 12

21. Future We built a game in Node. It rocks. Friday, April 20, 12

22. Future We built a game in Node. It rocks. Friday, April 20, 12

23. New Scaling Story Single user might have 5 messages with the server in 1 second. Connection lasts 30 minutes, not 100ms. Friday, April 20, 12

24. Scaling node We’re exploring this now. And need help. Friday, April 20, 12

25. Random Tips Friday, April 20, 12

26. Show Me What’s Wrong Second coolest website ever. http://showmewhatswrong.com/ Friday, April 20, 12

27. Poor man’s SMS alerts Setup GMail filter for SMS 1. Add filter for name+sms@hotstartup.com 2. Forward to 4155551234@vtext.com (VZW) 3. Your app can now text you anytime, for free. Friday, April 20, 12

28. Ambient Trafﬁc Awareness Get the New Relic Menu Bar Always know about how much traffic you have. (Available in Mac App Store) Friday, April 20, 12

29. Use Vogue! Never refresh for CSS again! Vogue github.com/quizlet/vogue Friday, April 20, 12

30. Thanks! Follow: @asuth @quizlet Friday, April 20, 12

Scaling Quizlet

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