Silo-Based Architectures for High Availability Applications @CodeCampCluj

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The document discusses silo-based architectures for high availability applications. It describes how applications can be divided into isolated "silos" to improve redundancy, resilience and the ability to perform live upgrades. Key advantages of silo architectures include enabling A/B testing without disruptions and simplifying scalability. Challenges include increased complexity for monitoring and debugging failures across silos. The presentation provides an overview of high availability concepts and argues that silo-based designs can help meet availability needs for mission critical systems.

Technology

SILO-BASED ARCHITECTURES
Georgiana Gligor
Tekkie Consulting
FOR HIGH AVAILABILITY APPLICATIONS
CodeCamp Cluj
May 2016

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016
Georgiana Gligor
✓ Geek. Mother. Do-er.
✓ Crafting enterprise-level apps
on LAMP stack since 2003
✓ Architecture and DevOps consultant
✓ PHP Cluj Meetup Organizer
3

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016
Agenda
✓who needs to address high availability?
✓describe high availability
✓silos: a possible approach
✓advantages and disadvantages
4

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016
Software industry is
built around
anticipating change.
David Scott Bernstein, “Beyond Legacy Code”
5

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 6
YOUR
APPLICATION

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016
Standard Application Components
7

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 8

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 9

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016
master
FrontendBusiness
Logic
FrontendFrontend
Browser
internet
Load
balancer
slave
reads writes
How Do You Adjust?
10

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 13
Typical Application Layering

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 14
Application Components

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 15
HIGH AVAILABILITY

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016
Ability to access the system:
✓ retrieve information
✓ alter information
✓ send new data
Availability
16

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016
Downtime
▸ scheduled
▸ unscheduled
17

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016
The 9s Dance
18
Uptime Shortname
Downtime
(per year)
90.000 % one nine 36.5 days
99.000 % two nines 3.65 days
99.900 % three nines 8.76 hrs
99.990 % four nines 52.56 mins
99.999 % ﬁve nines 5.26 mins

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016
A man's got to know
his limitations.
Dirty Harry
19

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016
HA System Design Principles
1. eliminate single points of failure
2. reliable crossover
3. detect failures as they occur
20

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 21
SILOS

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016
Departments inside
a company do not
work together.
Silo Mentality
22

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016
User Behaviour
23
booking
.com
expedia
.com
imobiliare
.ro
Alexa Rank 111 429 22879
daily time
on site
10:00
mins
7:20
mins
10:30
mins
daily pageviews
per visitor
7.51 5.12 9.60
bounce rate 21.20 % 22.10 % 22.80 %

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 24
Application Components (again)

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 25
Happens to the Best

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 26
Silo-Based Architecture

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 27
Silos: Multiple Caches

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 28
Silos: A/B Testing

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 29
Silos: Live Upgrades

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016
Disadvantages
✓ needs razor-sharp DevOps team
✓ small increase in hardware costs on kick-off
✓ adds complexity to the monitoring layer
✓ reconsider traceability
✓ reproducing and hunting bugs is going to
change forever
31

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 32
TAKEAWAYS

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 33

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016
Takeaways
✓ build situational awareness with clever
monitoring
✓ automate outage detection
✓ powerful A/B testing
✓ think long-term
34

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016
Further Reading
✓ Wikipedia HA page
✓ OpenStack’s HA concepts
✓ Merge Hemo report from FDA
✓ USA Presidential Policy Directive 21
✓ “Beyond Legacy Code” book
✓ Varnish Plus
35

Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 36
Q & A

THANK YOU!
Discover. Design.
Develop. Deliver.
Georgiana Gligor
@gbtekkie

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2. SILO-BASED ARCHITECTURES Georgiana Gligor Tekkie Consulting FOR HIGH AVAILABILITY APPLICATIONS CodeCamp Cluj May 2016

3. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 Georgiana Gligor ✓ Geek. Mother. Do-er. ✓ Crafting enterprise-level apps on LAMP stack since 2003 ✓ Architecture and DevOps consultant ✓ PHP Cluj Meetup Organizer 3

4. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 Agenda ✓who needs to address high availability? ✓describe high availability ✓silos: a possible approach ✓advantages and disadvantages 4

5. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 Software industry is built around anticipating change. David Scott Bernstein, “Beyond Legacy Code” 5

6. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 6 YOUR APPLICATION

7. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 Standard Application Components 7

8. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 8

9. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 9

10. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 master FrontendBusiness Logic FrontendFrontend Browser internet Load balancer slave reads writes How Do You Adjust? 10

11. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 master FrontendBusiness Logic FrontendFrontend Browser internet Load balancer slave reads writes How Do You Adjust? 11 redundancy

12. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 master FrontendBusiness Logic FrontendFrontend Browser internet Load balancer slave reads writes How Do You Adjust? 12 resilience

13. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 13 Typical Application Layering

14. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 14 Application Components

15. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 15 HIGH AVAILABILITY

16. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 Ability to access the system: ✓ retrieve information ✓ alter information ✓ send new data Availability 16

17. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 Downtime ▸ scheduled ▸ unscheduled 17

18. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 The 9s Dance 18 Uptime Shortname Downtime (per year) 90.000 % one nine 36.5 days 99.000 % two nines 3.65 days 99.900 % three nines 8.76 hrs 99.990 % four nines 52.56 mins 99.999 % ﬁve nines 5.26 mins

19. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 A man's got to know his limitations. Dirty Harry 19

20. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 HA System Design Principles 1. eliminate single points of failure 2. reliable crossover 3. detect failures as they occur 20

21. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 21 SILOS

22. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 Departments inside a company do not work together. Silo Mentality 22

23. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 User Behaviour 23 booking .com expedia .com imobiliare .ro Alexa Rank 111 429 22879 daily time on site 10:00 mins 7:20 mins 10:30 mins daily pageviews per visitor 7.51 5.12 9.60 bounce rate 21.20 % 22.10 % 22.80 %

24. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 24 Application Components (again)

25. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 25 Happens to the Best

26. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 26 Silo-Based Architecture

27. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 27 Silos: Multiple Caches

28. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 28 Silos: A/B Testing

29. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 29 Silos: Live Upgrades

30. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 Advantages ✓ real A/B testing ✓ no BHUF requirements ✓ no disruption => brand loyalty ✓ lower TCO ✓ simplify scalability ✓ avoid unneeded complexity by reusing familiar technologies 30

31. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 Disadvantages ✓ needs razor-sharp DevOps team ✓ small increase in hardware costs on kick-off ✓ adds complexity to the monitoring layer ✓ reconsider traceability ✓ reproducing and hunting bugs is going to change forever 31

32. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 32 TAKEAWAYS

33. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 33

34. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 Takeaways ✓ build situational awareness with clever monitoring ✓ automate outage detection ✓ powerful A/B testing ✓ think long-term 34

35. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 Further Reading ✓ Wikipedia HA page ✓ OpenStack’s HA concepts ✓ Merge Hemo report from FDA ✓ USA Presidential Policy Directive 21 ✓ “Beyond Legacy Code” book ✓ Varnish Plus 35

36. Silo-Based Architectures For High Availability Applications - Georgiana Gligor - CodeCamp Cluj - May 2016 36 Q & A

37. THANK YOU! Discover. Design. Develop. Deliver. Georgiana Gligor @gbtekkie

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