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Help! I've created a serverless monolith - Azure Lowlands
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Marc Duiker
June 30, 2022
Programming
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Help! I've created a serverless monolith - Azure Lowlands
Slides for my session at Azure Lowlands.
Marc Duiker
June 30, 2022
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Transcript
@MarcDuiker
@MarcDuiker Marc Duiker Sr Developer Advocate
@MarcDuiker 3
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@MarcDuiker 5
@MarcDuiker 6
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@MarcDuiker 8
@MarcDuiker 9 https://en.wikipedia.org/wiki/Monolithic_application “In software engineering, a monolithic application describes
a software application that is designed without modularity.”
@MarcDuiker 10 https://en.wikipedia.org/wiki/Modularity “…modularity is the degree to which a
system's components may be separated and recombined, often with the benefit of flexibility and variety in use.”
@MarcDuiker App Server DB Server
@MarcDuiker 13 Function App Function App Queue Storage
@MarcDuiker 14 Function App Function App Queue Database
@MarcDuiker 15
@MarcDuiker 16
@MarcDuiker 17
@MarcDuiker 18
@MarcDuiker 19 https://martinfowler.com/articles/agileStory.html “We eventually agreed on "agile" as we
felt that captured the adaptiveness and response to change which we felt was so important to our approach…”
@MarcDuiker 20
@MarcDuiker 21
@MarcDuiker 22
@MarcDuiker 23
@MarcDuiker
@MarcDuiker
@MarcDuiker Task on backlog Work started Work completed
@MarcDuiker 29 https://www.atlassian.com/incident-management/kpis/common-metrics
@MarcDuiker 30 https://www.atlassian.com/incident-management/kpis/common-metrics
@MarcDuiker https://www.atlassian.com/incident-management/kpis/common-metrics
@MarcDuiker 32
@MarcDuiker 33
@MarcDuiker 35 Caused by the nature of the (business) problem.
Can’t be easily reduced. Caused by decisions we make related to architecture, frameworks, packages, code style etc. Can be reduced. https://en.wikipedia.org/wiki/Programming_complexity
@MarcDuiker 36 https://en.wikipedia.org/wiki/Programming_complexity Caused by decisions we make related to
architecture, frameworks, packages, code style etc. Can be reduced. Caused by the nature of the (business) problem. Can’t be easily reduced.
@MarcDuiker 37
@MarcDuiker 38
@MarcDuiker 40
@MarcDuiker 41
@MarcDuiker 42
@MarcDuiker 45
@MarcDuiker 46
@MarcDuiker 47
@MarcDuiker 48
@MarcDuiker 49 Domain Bounded Context Bounded Context Bounded Context Bounded
Context https://thedomaindrivendesign.io/bounded-context/
@MarcDuiker 50 Ecommerce Product Catalog Inventory Billing Shopping Basket https://thedomaindrivendesign.io/bounded-context/
@MarcDuiker “Ubiquitous language identifies the terms and concepts within a
bounded context that are unambiguous and agreed upon by all stakeholders.” https://thedomaindrivendesign.io/what-is-strategic-design
@MarcDuiker 52 Banking Context Ecommerce Context https://thedomaindrivendesign.io/what-is-strategic-design
@MarcDuiker 53
@MarcDuiker 54
@MarcDuiker “Resilience is the ability to provide and maintain an
acceptable level of service in the face of faults and challenges to normal operation.” https://en.wikipedia.org/wiki/Resilience_(network)
@MarcDuiker
@MarcDuiker https://docs.microsoft.com/en-us/azure/architecture/patterns/
@MarcDuiker 60
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@MarcDuiker 62 Function App B Function App A Queue Storage
@MarcDuiker 63
@MarcDuiker 64 Increase number of (virtual) machines Increase CPU /
memory of one machine
@MarcDuiker 66
@MarcDuiker
@MarcDuiker 68 Fan out Fan out No fan out No
fan out
@MarcDuiker 69 Fan out Fan out No fan out No
fan out https://docs.microsoft.com/en-us/azure/azure-functions/functions-scale#scale Use dedicated resource to its fullest
@MarcDuiker 70 Fan out Fan out No fan out No
fan out https://docs.microsoft.com/en-us/azure/azure-functions/functions-scale#scale Use higher tier / sku Use regular tier / sku
@MarcDuiker 74 Ask yourself these questions before adding any code:
- Do *I* need to write this? - Is this a good fit with the rest of the app? - What is the impact regarding resilience/scalability of the app?
@MarcDuiker 75 https://quest.ably.dev/
@MarcDuiker 76 Twitter: @marcduiker YouTube: http://bit.ly/marc-serverless Ably Discord: https://discord.gg/q89gDHZcBK