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Strategies In Continuous Delivery
Learn the “magic” behind the scenes

DEVOPS Days Tel Aviv 2013
Aviran Mordo
Head Of Back-End Engineering @ Wix
@aviranm
http://www.linkedin.com/in/aviran

03:14
About Wix

03:14
Wix in Numbers
• Over 39,000,000 users
– Adding over 1,000,000 new users each month

• Static storage is over 150TB of data
– Adding over 1TB of files every day

• 3 Data centers + 2 Clouds (Google AE, Amazon)
– Around 300 servers

• Over 100,000,000 Server API calls per day
• ~450 people work at wix
– ~ 150 people in R&D

03:14
Do You Have The Guts To
Deploy 10 Times A Day?
03:14
From Jan’ 2013 – Jun’ 2013
• 1500
• 470
• 200
03:14
From Jan’ 2013 – Jun’2013
• 1500 Deployments
• 470 A/B Tests
• 200 Feature Toggles
03:14
Continuous Delivery – Key points
• Abandon the “VERSION” paradigm – move to a
feature centric methodology
• Make small and frequent release as soon as
possible
• Automate everything – TDD/CI/CD
• Measure Everything
– A/B test every new feature
– Monitor real KPIs (business, not CPU)
03:14
Test Driven Development

• No new code is pushed to Git without being fully tested
– We currently have around 10,000 automated tests

• Before fixing a bug first write a test to reproduce the bug

• Cover legacy (untested) systems with Integration tests
03:14
Test Driven Development

• Actual impact on development
– We develop products faster
– Removes fear of change
– Easier to enter some one else’s project
– Do we really need QA? (Yes, they code tests)
– Writing a feature is 10-30% slower, 45-90% less bugs
– 50% faster to reach production.
– Considerably less time to fix bugs
03:14
Feature Toggles

03:14
Feature Toggles

• Everyone develops on the Trunk

• Every piece of code can get to production at
anytime

03:14
Code branch

Yes

New Code

03:14

FT
Opene
d

No

Old Code
Usage example
Simple “if” statement in your code

03:14
DB Schema Changes Without
Downtime
• Adding columns
– Use another table link by primary key
– Use blob field for schema flexibility

• Removing fields
– Stop using. Do not make any DB schema
changes

03:14
New DB schema with data migration
• Plan a lazy migration path controlled by feature toggle

1.
2.
3.
4.
5.
6.
03:14

Write to old / Read from old
Write to both / Read from old
Write to both / Read from new, fallback to old
Write to new / Read from new, fallback to old
Eagerly migrate data in the background
Write to new / Read from new
Feature Toggle Strategies (gradual expose users)

•
•
•
•
•
•
•
•

03:14

Company employees
Specific users or group of users
Percentage of traffic
By GEO
By Language
By user-agent
User Profile based
By context (site id or some kind of hash on site id)
Feature Toggle Override
• By specific server
– Used to test system load
– New database flows/migration
– Refactoring that may affect performance and memory usage

• By Url parameter
– Enable internal testing
– Product acceptance
– Faking GEO

• By FT cookie value
– Testing
– When working with API on a single page application

03:14
Feature Toggles Management

03:14
A/B Tests

03:14
A/B Test

• Every new feature is A/B tested
• We open the new feature to a % of users
– Define KPIs to check if the new feature is
better or worse
– If it is better, we keep it
– If worse, we check why and improve
– If we find flaws, the impact is just for % of our
users (kind of Feature Toggle)

03:14
An interesting site effect on product
• How many times did you have the conversion
“what is better”?
– Put the menu on top / on the side

• Well, how about building both and A/B Testing?

03:14
Marking users with toss value in a
cookie
• Anonymous user
– Toss is randomly determined
– Can not guarantee persistent experience if changing browser

• Registered User
– Toss is determined by the user ID
– Guarantee toss persistency across browsers
– Allows setting additional tossing criteria (for example new users
only)
03:14
– Only use this for sections that a user has to be authenticated
• Do not mix anonymous and registered tests
• AB test parentage of users with optional filters
– New Users Only (Registered users only)
– By language
– By GEO
– By Browser
– user-agent
– OS
– Any other criteria you have on your users
03:14
A/B Test Features
• A/B Test Override
– Allows to set a value of a test for validation
– Helps support experience what users experiencing

• Override methods
– Via URL parameter
– Via cookie

• Start/Stop Test
• Pause tests
• Bots always get “A”
03:14
Manage your tests

03:14
Self Test / Post Deployment Test
After each server deployment run a self test before deploying the
next server.
• Checking server configuration and topology
– Make sure database is accessible (DB connection string)
– Is the schema the one I expect
– Access required local resources (data files, other config files, templates,
etc’)
– Access remote resources
– RPC / REST endpoints reachable and operational

• Server will refuse requests unless it passes the self test
03:14
• Allow a way to skip self test (and continue deployment)
Tools - App-info

03:14
03:14
(blank)

6/16/2013

6/11/2013

6/7/2013

6/4/2013

6/1/2013

5/29/2013

5/26/2013

5/22/2013

5/19/2013

5/13/2013

5/9/2013

5/6/2013

5/1/2013

4/28/2013

4/23/2013

4/19/2013

4/15/2013

4/10/2013

4/7/2013

4/3/2013

3/24/2013

3/19/2013

3/15/2013

3/12/2013

3/7/2013

3/4/2013

2/28/2013

2/25/2013

2/21/2013

2/18/2013

2/13/2013

2/10/2013

2/6/2013

2/3/2013

1/30/2013

1/27/2013

1/22/2013

1/18/2013

1/15/2013

1/11/2013

1/8/2013

1/4/2013

1/1/2013

Where are we today?

• We have re-written our flash editor product as an
HTML 5 editor
– In just 4 months

• Introduced Wix 3rd party applications (developers API)
– In just 6 weeks

• We are easily replacing significant parts of our
infrastructure
Total
• And we are doing ~10 releases a day!

35

30

25

20

15

10
Total

5

0
Aviran Mordo
@aviranm
http://www.linkedin.com/in/aviran
http://www.aviransplace.com

http://www.slideshare.net/aviranwix/strategies-incontinuous-delivery

Read more: The Road To Continuous Delivery:
http://goo.gl/K6zEK
03:14

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DevOps Days Tel Aviv 2013: Real world strategies in continuous delivery - Aviran Mordo

  • 1. Strategies In Continuous Delivery Learn the “magic” behind the scenes DEVOPS Days Tel Aviv 2013 Aviran Mordo Head Of Back-End Engineering @ Wix @aviranm http://www.linkedin.com/in/aviran 03:14
  • 3. Wix in Numbers • Over 39,000,000 users – Adding over 1,000,000 new users each month • Static storage is over 150TB of data – Adding over 1TB of files every day • 3 Data centers + 2 Clouds (Google AE, Amazon) – Around 300 servers • Over 100,000,000 Server API calls per day • ~450 people work at wix – ~ 150 people in R&D 03:14
  • 4. Do You Have The Guts To Deploy 10 Times A Day? 03:14
  • 5. From Jan’ 2013 – Jun’ 2013 • 1500 • 470 • 200 03:14
  • 6. From Jan’ 2013 – Jun’2013 • 1500 Deployments • 470 A/B Tests • 200 Feature Toggles 03:14
  • 7. Continuous Delivery – Key points • Abandon the “VERSION” paradigm – move to a feature centric methodology • Make small and frequent release as soon as possible • Automate everything – TDD/CI/CD • Measure Everything – A/B test every new feature – Monitor real KPIs (business, not CPU) 03:14
  • 8. Test Driven Development • No new code is pushed to Git without being fully tested – We currently have around 10,000 automated tests • Before fixing a bug first write a test to reproduce the bug • Cover legacy (untested) systems with Integration tests 03:14
  • 9. Test Driven Development • Actual impact on development – We develop products faster – Removes fear of change – Easier to enter some one else’s project – Do we really need QA? (Yes, they code tests) – Writing a feature is 10-30% slower, 45-90% less bugs – 50% faster to reach production. – Considerably less time to fix bugs 03:14
  • 11. Feature Toggles • Everyone develops on the Trunk • Every piece of code can get to production at anytime 03:14
  • 13. Usage example Simple “if” statement in your code 03:14
  • 14. DB Schema Changes Without Downtime • Adding columns – Use another table link by primary key – Use blob field for schema flexibility • Removing fields – Stop using. Do not make any DB schema changes 03:14
  • 15. New DB schema with data migration • Plan a lazy migration path controlled by feature toggle 1. 2. 3. 4. 5. 6. 03:14 Write to old / Read from old Write to both / Read from old Write to both / Read from new, fallback to old Write to new / Read from new, fallback to old Eagerly migrate data in the background Write to new / Read from new
  • 16. Feature Toggle Strategies (gradual expose users) • • • • • • • • 03:14 Company employees Specific users or group of users Percentage of traffic By GEO By Language By user-agent User Profile based By context (site id or some kind of hash on site id)
  • 17. Feature Toggle Override • By specific server – Used to test system load – New database flows/migration – Refactoring that may affect performance and memory usage • By Url parameter – Enable internal testing – Product acceptance – Faking GEO • By FT cookie value – Testing – When working with API on a single page application 03:14
  • 20. A/B Test • Every new feature is A/B tested • We open the new feature to a % of users – Define KPIs to check if the new feature is better or worse – If it is better, we keep it – If worse, we check why and improve – If we find flaws, the impact is just for % of our users (kind of Feature Toggle) 03:14
  • 21. An interesting site effect on product • How many times did you have the conversion “what is better”? – Put the menu on top / on the side • Well, how about building both and A/B Testing? 03:14
  • 22. Marking users with toss value in a cookie • Anonymous user – Toss is randomly determined – Can not guarantee persistent experience if changing browser • Registered User – Toss is determined by the user ID – Guarantee toss persistency across browsers – Allows setting additional tossing criteria (for example new users only) 03:14 – Only use this for sections that a user has to be authenticated
  • 23. • Do not mix anonymous and registered tests • AB test parentage of users with optional filters – New Users Only (Registered users only) – By language – By GEO – By Browser – user-agent – OS – Any other criteria you have on your users 03:14
  • 24. A/B Test Features • A/B Test Override – Allows to set a value of a test for validation – Helps support experience what users experiencing • Override methods – Via URL parameter – Via cookie • Start/Stop Test • Pause tests • Bots always get “A” 03:14
  • 26. Self Test / Post Deployment Test After each server deployment run a self test before deploying the next server. • Checking server configuration and topology – Make sure database is accessible (DB connection string) – Is the schema the one I expect – Access required local resources (data files, other config files, templates, etc’) – Access remote resources – RPC / REST endpoints reachable and operational • Server will refuse requests unless it passes the self test 03:14 • Allow a way to skip self test (and continue deployment)
  • 28. 03:14 (blank) 6/16/2013 6/11/2013 6/7/2013 6/4/2013 6/1/2013 5/29/2013 5/26/2013 5/22/2013 5/19/2013 5/13/2013 5/9/2013 5/6/2013 5/1/2013 4/28/2013 4/23/2013 4/19/2013 4/15/2013 4/10/2013 4/7/2013 4/3/2013 3/24/2013 3/19/2013 3/15/2013 3/12/2013 3/7/2013 3/4/2013 2/28/2013 2/25/2013 2/21/2013 2/18/2013 2/13/2013 2/10/2013 2/6/2013 2/3/2013 1/30/2013 1/27/2013 1/22/2013 1/18/2013 1/15/2013 1/11/2013 1/8/2013 1/4/2013 1/1/2013 Where are we today? • We have re-written our flash editor product as an HTML 5 editor – In just 4 months • Introduced Wix 3rd party applications (developers API) – In just 6 weeks • We are easily replacing significant parts of our infrastructure Total • And we are doing ~10 releases a day! 35 30 25 20 15 10 Total 5 0

Editor's Notes

  1. Today I’m going to tell you some of the strategies we use that allow us to deploy 10 times a day
  2. Wix is a web publishing platform
  3. Management role is to help developer do its work
  4. One of the key components to successful CD
  5. Full load on a single serverOverride size limitation by setting a cookie on the client
  6. Link to purchase on the editor was causing drop in conversion because users went there too soon without intent
  7. Link to purchase on the editor was causing drop in conversion because users went there too soon without intent