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PRINCIPLES OF
MICROSERVICES
Sam Newman
XP Days Ukraine December 2014
1
@samnewman#xpdays
@samnewman#xpdays
Accounts
Returns
Invoicing
Shipping
Inventory
Customer
Service
@samnewman#xpdays
Accounts
Returns
Invoicing
Shipping
Inventory
Customer
Service
Small Autonomous services
that work toget...
@samnewman#xpdays
4
Show Gilt, Groupon, Netflix, Amazon
@samnewman#xpdays
4
Show Gilt, Groupon, Netflix, Amazon
@samnewman#xpdays
4
Show Gilt, Groupon, Netflix, Amazon
@samnewman#xpdays
Sam Newman
Building
Microservices
DESIGNING FINE-GRAINED SYSTEMS
@samnewman#xpdays
@samnewman#xpdays http://www.12factor.net/
@samnewman#xpdays
Strategic Goals
Architectural
Principles
Design and Delivery
Practices
Enable scalable
business
More cus...
@samnewman#xpdays
Small Autonomous services
that work together
@samnewman#xpdays
10
Principles Of
Microservices
@samnewman#xpdays
10
Principles Of
Microservices
Modelled Around
Business Domain
@samnewman#xpdays
10
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation
@samnewman#xpdays
10
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
10
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
10
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
10
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
10
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
10
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
Accounts
Returns
Invoicing
Shipping
Inventory
Customer
Service
@samnewman#xpdays
@samnewman#xpdays
13
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
13
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
@samnewman#xpdays
3 Months
2 Microservices
@samnewman#xpdays
3 Months
2 Microservices
12 Months
10 Microservices
@samnewman#xpdays
3 Months
2 Microservices
12 Months
10 Microservices
18 Months
60 Microservices
@samnewman#xpdays
Infrastructure Automation
@samnewman#xpdays
Infrastructure Automation
Automated Testing
@samnewman#xpdays
Infrastructure Automation
Continuous Delivery
Automated Testing
@samnewman#xpdays
16
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
16
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation
Hide Implementation...
@samnewman#xpdays
DB
@samnewman#xpdays
DB
@samnewman#xpdays
DB
@samnewman#xpdays
DB
@samnewman#xpdays
DB
HIDE YOUR DATABASE
@samnewman#xpdays
http://martinfowler.com/bliki/images/boundedContext/sketch.png
@samnewman#xpdays
19
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
19
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
@samnewman#xpdays
What is autonomy?
@samnewman#xpdays
What is autonomy?
Giving people as much freedom as possible
to do the job at hand
@samnewman#xpdays
What is autonomy?
Giving people as much freedom as possible
to do the job at hand
@samnewman#xpdays
SELF-SERVICE
https://www.flickr.com/photos/katsrcool/15184711908/
@samnewman#xpdays
http://tech.gilt.com/post/102628539834/making-architecture-work-in-microservice
SHARED GOVERNANCE
@samnewman#xpdays
OWNER-OPERATOR
https://www.flickr.com/photos/stevendepolo/5939055612
@samnewman#xpdays
INTERNAL OPEN SOURCE
@samnewman#xpdays
DUMB-PIPES, SMART ENDPOINTS
Magical Mystery Bus
@samnewman#xpdays
Magical Mystery Bus
@samnewman#xpdays
@samnewman#xpdays
28
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
28
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
After the break!
@samnewman#xpdays
ONE SERVICE PER-HOST
Host
Service
@samnewman#xpdays
ONE SERVICE PER-HOST
Host
Service
Host
Service Service
Service Service
VS
@samnewman#xpdays
CONSUMER-DRIVEN CONTRACTS
Expectations
Prod
Shipping Inventory
@samnewman#xpdays
https://github.com/realestate-com-au/pact
@samnewman#xpdays
CO-EXIST ENDPOINTS
Customer Service
Shipping
@samnewman#xpdays
CO-EXIST ENDPOINTS
Customer Service
Shipping
V2V1
@samnewman#xpdays
CO-EXIST ENDPOINTS
Customer Service
Shipping
V2V1
@samnewman#xpdays
CO-EXIST ENDPOINTS
Customer Service
Shipping
V2
@samnewman#xpdays
34
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
34
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
@samnewman#xpdays
1 in 100
@samnewman#xpdays
1 in 100
@samnewman#xpdays
4 in 100
@samnewman#xpdays
Strangler App
@samnewman#xpdays
Strangler App
Legacy App
Legacy AppLegacy App
@samnewman#xpdays
Strangler App
Legacy App
Legacy App
Requests
Legacy App
@samnewman#xpdays
Strangler App
Legacy App
Legacy App
Requests
Legacy App
@samnewman#xpdays
Strangler App
Legacy App
Legacy App
Requests
Legacy App
@samnewman#xpdays
Strangler App
Legacy App
Legacy App
Requests
Legacy App
30 - 60 Concurrent Requests
@samnewman#xpdays
Strangler App
Legacy App
Legacy App
Requests
Legacy App
30 - 60 Concurrent Requests
> 800 Concurrent Req...
@samnewman#xpdays
Strangler App
Legacy App
Legacy App
Requests
Legacy App
30 - 60 Concurrent Requests
> 800 Concurrent Req...
@samnewman#xpdays
Strangler App
Legacy App Legacy App Legacy App
Thread Pool
@samnewman#xpdays
Strangler App
Legacy App Legacy App Legacy App
Thread Pool
Failing…slowly!
@samnewman#xpdays
Strangler App
Legacy App Legacy App Legacy App
Thread Pool
Failing…slowly!
@samnewman#xpdays
Strangler App
Legacy App Legacy App Legacy App
Thread Pool
Failing…slowly!
Thread-pool
exhausted
@samnewman#xpdays
Strangler App
Legacy App Legacy App Legacy App
Thread Pool
Failing…slowly!
Thread-pool
exhausted
No requ...
@samnewman#xpdays
Strangler App
Legacy App Legacy App Legacy App
Thread Pool
Failing…slowly!
Thread-pool
exhausted
No requ...
@samnewman#xpdays
Strangler App
Legacy App Legacy App Legacy App
Thread Pool
Failing…slowly!
Thread-pool
exhausted
Request...
@samnewman#xpdays
Strangler App
Legacy App Legacy App Legacy App
Thread Pool
@samnewman#xpdays
Strangler App
Legacy App Legacy App Legacy App
Fix Timeouts
Thread Pool
@samnewman#xpdays
Strangler App
Legacy App Legacy App Legacy App
Fix Timeouts
Thread Pool
@samnewman#xpdays
Strangler App
Legacy App Legacy App Legacy App
Fix Timeouts
Thread Pool Thread PoolThread Pool
@samnewman#xpdays
Strangler App
Legacy App Legacy App Legacy App
Fix Timeouts
Thread Pool Thread PoolThread Pool
Bulkhead
...
@samnewman#xpdays
Strangler App
Legacy App Legacy App Legacy App
Fix Timeouts
Thread Pool Thread PoolThread Pool
Bulkhead
...
@samnewman#xpdays
Strangler App
Legacy App Legacy App Legacy App
Fix Timeouts
Thread Pool Thread PoolThread Pool
Bulkhead
...
@samnewman#xpdays
39
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
39
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation...
@samnewman#xpdays
@samnewman#xpdays
AGGREGATION
@samnewman#xpdays
LOGS
AGGREGATION
@samnewman#xpdays
LOGS
STATS
AGGREGATION
@samnewman#xpdays
CORRELATION IDS
@samnewman#xpdays
CORRELATION IDS
ID 8964
@samnewman#xpdays
CORRELATION IDS
ID 8964
ID 8964
ID 8964
ID 8964
ID 8964
@samnewman#xpdays
Principles Of
Microservices
@samnewman#xpdays
Principles Of
Microservices
Modelled Around
Business Domain
@samnewman#xpdays
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation
@samnewman#xpdays
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation
De...
@samnewman#xpdays
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation
De...
@samnewman#xpdays
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation
De...
@samnewman#xpdays
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation
De...
@samnewman#xpdays
Principles Of
Microservices
Modelled Around
Business Domain
Culture Of
Automation Hide Implementation
De...
Sam Newman
@samnewman
THANKS!
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Principles of microservices XP Days Ukraine

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There has been lots of buzz around Microservices over the last year, but there has often been a lack of clarity as to what Microservices are, or how to implement them well. I've been working to distill down the principles of Microservices to help ensure that we don't just end up repeating the mistakes we made during the last 20 years of service oriented architecture.

Published in: Technology

Principles of microservices XP Days Ukraine

  1. 1. PRINCIPLES OF MICROSERVICES Sam Newman XP Days Ukraine December 2014 1
  2. 2. @samnewman#xpdays
  3. 3. @samnewman#xpdays Accounts Returns Invoicing Shipping Inventory Customer Service
  4. 4. @samnewman#xpdays Accounts Returns Invoicing Shipping Inventory Customer Service Small Autonomous services that work together
  5. 5. @samnewman#xpdays 4 Show Gilt, Groupon, Netflix, Amazon
  6. 6. @samnewman#xpdays 4 Show Gilt, Groupon, Netflix, Amazon
  7. 7. @samnewman#xpdays 4 Show Gilt, Groupon, Netflix, Amazon
  8. 8. @samnewman#xpdays Sam Newman Building Microservices DESIGNING FINE-GRAINED SYSTEMS
  9. 9. @samnewman#xpdays
  10. 10. @samnewman#xpdays http://www.12factor.net/
  11. 11. @samnewman#xpdays Strategic Goals Architectural Principles Design and Delivery Practices Enable scalable business More customers/transactions Self-service for customers Support entry into new markets Flexible operational processes New products and operational processes Support innovation in existing markets Flexible operational processes New products and operational processes Reduce inertia Make choices that favour rapid feedback and change, with reduced dependencies across teams. Eliminate accidental complexity Aggressively retire and replace unnecessarily complex processes, systems, and integrations so that we can focus on the essential complexity. Consistent interfaces and data flows Eliminate duplication of data and create clear systems of record, with consistent integration interfaces. No silver bullets Off the shelf solutions deliver early value but create inertia and accidental complexity. Standard REST/HTTP Encapsulate legacy Eliminate integration databases Consolidate and cleanse data Published integration model Small independent Services Continuous deployment Minimal customisation of COTS/SAAS
  12. 12. @samnewman#xpdays Small Autonomous services that work together
  13. 13. @samnewman#xpdays 10 Principles Of Microservices
  14. 14. @samnewman#xpdays 10 Principles Of Microservices Modelled Around Business Domain
  15. 15. @samnewman#xpdays 10 Principles Of Microservices Modelled Around Business Domain Culture Of Automation
  16. 16. @samnewman#xpdays 10 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details
  17. 17. @samnewman#xpdays 10 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Decentralise All The Things
  18. 18. @samnewman#xpdays 10 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Decentralise All The Things Deploy Independently
  19. 19. @samnewman#xpdays 10 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Decentralise All The Things Isolate Failure Deploy Independently
  20. 20. @samnewman#xpdays 10 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Decentralise All The Things Isolate Failure Deploy Independently Highly Observable
  21. 21. @samnewman#xpdays 10 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Decentralise All The Things Isolate Failure Deploy Independently Highly Observable
  22. 22. @samnewman#xpdays Accounts Returns Invoicing Shipping Inventory Customer Service
  23. 23. @samnewman#xpdays
  24. 24. @samnewman#xpdays 13 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Decentralise All The Things Isolate Failure Deploy Independently Highly Observable ✔
  25. 25. @samnewman#xpdays 13 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Decentralise All The Things Isolate Failure Deploy Independently Highly Observable ✔
  26. 26. @samnewman#xpdays
  27. 27. @samnewman#xpdays 3 Months 2 Microservices
  28. 28. @samnewman#xpdays 3 Months 2 Microservices 12 Months 10 Microservices
  29. 29. @samnewman#xpdays 3 Months 2 Microservices 12 Months 10 Microservices 18 Months 60 Microservices
  30. 30. @samnewman#xpdays Infrastructure Automation
  31. 31. @samnewman#xpdays Infrastructure Automation Automated Testing
  32. 32. @samnewman#xpdays Infrastructure Automation Continuous Delivery Automated Testing
  33. 33. @samnewman#xpdays 16 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Decentralise All The Things Isolate Failure Deploy Independently Highly Observable ✔ ✔
  34. 34. @samnewman#xpdays 16 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Decentralise All The Things Isolate Failure Deploy Independently Highly Observable ✔ ✔
  35. 35. @samnewman#xpdays DB
  36. 36. @samnewman#xpdays DB
  37. 37. @samnewman#xpdays DB
  38. 38. @samnewman#xpdays DB
  39. 39. @samnewman#xpdays DB HIDE YOUR DATABASE
  40. 40. @samnewman#xpdays http://martinfowler.com/bliki/images/boundedContext/sketch.png
  41. 41. @samnewman#xpdays 19 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Decentralise All The Things Isolate Failure Deploy Independently Highly Observable ✔ ✔ ✔
  42. 42. @samnewman#xpdays 19 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Decentralise All The Things Isolate Failure Deploy Independently Highly Observable ✔ ✔ ✔
  43. 43. @samnewman#xpdays
  44. 44. @samnewman#xpdays What is autonomy?
  45. 45. @samnewman#xpdays What is autonomy? Giving people as much freedom as possible to do the job at hand
  46. 46. @samnewman#xpdays What is autonomy? Giving people as much freedom as possible to do the job at hand
  47. 47. @samnewman#xpdays SELF-SERVICE https://www.flickr.com/photos/katsrcool/15184711908/
  48. 48. @samnewman#xpdays http://tech.gilt.com/post/102628539834/making-architecture-work-in-microservice SHARED GOVERNANCE
  49. 49. @samnewman#xpdays OWNER-OPERATOR https://www.flickr.com/photos/stevendepolo/5939055612
  50. 50. @samnewman#xpdays INTERNAL OPEN SOURCE
  51. 51. @samnewman#xpdays DUMB-PIPES, SMART ENDPOINTS Magical Mystery Bus
  52. 52. @samnewman#xpdays Magical Mystery Bus
  53. 53. @samnewman#xpdays
  54. 54. @samnewman#xpdays 28 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Isolate Failure Deploy Independently Highly Observable ✔ ✔ ✔ Decentralise All The Things ✔
  55. 55. @samnewman#xpdays 28 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Isolate Failure Deploy Independently Highly Observable ✔ ✔ ✔ Decentralise All The Things ✔
  56. 56. @samnewman#xpdays After the break!
  57. 57. @samnewman#xpdays ONE SERVICE PER-HOST Host Service
  58. 58. @samnewman#xpdays ONE SERVICE PER-HOST Host Service Host Service Service Service Service VS
  59. 59. @samnewman#xpdays CONSUMER-DRIVEN CONTRACTS Expectations Prod Shipping Inventory
  60. 60. @samnewman#xpdays https://github.com/realestate-com-au/pact
  61. 61. @samnewman#xpdays CO-EXIST ENDPOINTS Customer Service Shipping
  62. 62. @samnewman#xpdays CO-EXIST ENDPOINTS Customer Service Shipping V2V1
  63. 63. @samnewman#xpdays CO-EXIST ENDPOINTS Customer Service Shipping V2V1
  64. 64. @samnewman#xpdays CO-EXIST ENDPOINTS Customer Service Shipping V2
  65. 65. @samnewman#xpdays 34 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Isolate Failure Highly Observable ✔ ✔ ✔ Decentralise All The Things ✔ Deploy Independently✔
  66. 66. @samnewman#xpdays 34 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Isolate Failure Highly Observable ✔ ✔ ✔ Decentralise All The Things ✔ Deploy Independently✔
  67. 67. @samnewman#xpdays
  68. 68. @samnewman#xpdays 1 in 100
  69. 69. @samnewman#xpdays 1 in 100
  70. 70. @samnewman#xpdays 4 in 100
  71. 71. @samnewman#xpdays Strangler App
  72. 72. @samnewman#xpdays Strangler App Legacy App Legacy AppLegacy App
  73. 73. @samnewman#xpdays Strangler App Legacy App Legacy App Requests Legacy App
  74. 74. @samnewman#xpdays Strangler App Legacy App Legacy App Requests Legacy App
  75. 75. @samnewman#xpdays Strangler App Legacy App Legacy App Requests Legacy App
  76. 76. @samnewman#xpdays Strangler App Legacy App Legacy App Requests Legacy App 30 - 60 Concurrent Requests
  77. 77. @samnewman#xpdays Strangler App Legacy App Legacy App Requests Legacy App 30 - 60 Concurrent Requests > 800 Concurrent Requests
  78. 78. @samnewman#xpdays Strangler App Legacy App Legacy App Requests Legacy App 30 - 60 Concurrent Requests > 800 Concurrent Requests
  79. 79. @samnewman#xpdays Strangler App Legacy App Legacy App Legacy App Thread Pool
  80. 80. @samnewman#xpdays Strangler App Legacy App Legacy App Legacy App Thread Pool Failing…slowly!
  81. 81. @samnewman#xpdays Strangler App Legacy App Legacy App Legacy App Thread Pool Failing…slowly!
  82. 82. @samnewman#xpdays Strangler App Legacy App Legacy App Legacy App Thread Pool Failing…slowly! Thread-pool exhausted
  83. 83. @samnewman#xpdays Strangler App Legacy App Legacy App Legacy App Thread Pool Failing…slowly! Thread-pool exhausted No requests to other downstream apps
  84. 84. @samnewman#xpdays Strangler App Legacy App Legacy App Legacy App Thread Pool Failing…slowly! Thread-pool exhausted No requests to other downstream apps
  85. 85. @samnewman#xpdays Strangler App Legacy App Legacy App Legacy App Thread Pool Failing…slowly! Thread-pool exhausted Requests Building Up No requests to other downstream apps
  86. 86. @samnewman#xpdays Strangler App Legacy App Legacy App Legacy App Thread Pool
  87. 87. @samnewman#xpdays Strangler App Legacy App Legacy App Legacy App Fix Timeouts Thread Pool
  88. 88. @samnewman#xpdays Strangler App Legacy App Legacy App Legacy App Fix Timeouts Thread Pool
  89. 89. @samnewman#xpdays Strangler App Legacy App Legacy App Legacy App Fix Timeouts Thread Pool Thread PoolThread Pool
  90. 90. @samnewman#xpdays Strangler App Legacy App Legacy App Legacy App Fix Timeouts Thread Pool Thread PoolThread Pool Bulkhead Downstream Connections
  91. 91. @samnewman#xpdays Strangler App Legacy App Legacy App Legacy App Fix Timeouts Thread Pool Thread PoolThread Pool Bulkhead Downstream Connections
  92. 92. @samnewman#xpdays Strangler App Legacy App Legacy App Legacy App Fix Timeouts Thread Pool Thread PoolThread Pool Bulkhead Downstream Connections Circuit Breakers
  93. 93. @samnewman#xpdays 39 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Highly Observable ✔ ✔ ✔ Decentralise All The Things ✔ Deploy Independently✔ Isolate Failure✔
  94. 94. @samnewman#xpdays 39 Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Highly Observable ✔ ✔ ✔ Decentralise All The Things ✔ Deploy Independently✔ Isolate Failure✔
  95. 95. @samnewman#xpdays
  96. 96. @samnewman#xpdays AGGREGATION
  97. 97. @samnewman#xpdays LOGS AGGREGATION
  98. 98. @samnewman#xpdays LOGS STATS AGGREGATION
  99. 99. @samnewman#xpdays CORRELATION IDS
  100. 100. @samnewman#xpdays CORRELATION IDS ID 8964
  101. 101. @samnewman#xpdays CORRELATION IDS ID 8964 ID 8964 ID 8964 ID 8964 ID 8964
  102. 102. @samnewman#xpdays Principles Of Microservices
  103. 103. @samnewman#xpdays Principles Of Microservices Modelled Around Business Domain
  104. 104. @samnewman#xpdays Principles Of Microservices Modelled Around Business Domain Culture Of Automation
  105. 105. @samnewman#xpdays Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details
  106. 106. @samnewman#xpdays Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Decentralise All The Things
  107. 107. @samnewman#xpdays Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Decentralise All The Things Deploy Independently
  108. 108. @samnewman#xpdays Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Decentralise All The Things Isolate Failure Deploy Independently
  109. 109. @samnewman#xpdays Principles Of Microservices Modelled Around Business Domain Culture Of Automation Hide Implementation Details Decentralise All The Things Isolate Failure Deploy Independently Highly Observable
  110. 110. Sam Newman @samnewman THANKS!

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