Help! I've created a serverless monolith! - NDC Oslo 2022

@MarcDuiker

View Slide

@MarcDuiker 2
Marc Duiker
Sr Developer Advocate

View Slide

@MarcDuiker 3
Marc Duiker
Sr Developer Advocate

View Slide

@MarcDuiker 4

View Slide

@MarcDuiker

View Slide

@MarcDuiker 6

View Slide

@MarcDuiker 7

View Slide

@MarcDuiker 8

View Slide

@MarcDuiker 9

View Slide

@MarcDuiker 10
https://en.wikipedia.org/wiki/Monolithic_application
“In software engineering, a monolithic
application describes a software application
that is designed without modularity.”

View Slide

@MarcDuiker 11
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.”

View Slide

@MarcDuiker 12
App Server DB Server

View Slide

@MarcDuiker 13
Function App
Function App Queue Storage

View Slide

@MarcDuiker 14
Function App
Function App Queue Storage

View Slide

@MarcDuiker 15

View Slide

@MarcDuiker 16

View Slide

@MarcDuiker 17

View Slide

@MarcDuiker

View Slide

@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…”

View Slide

@MarcDuiker 20

View Slide

@MarcDuiker 21

View Slide

@MarcDuiker 22

View Slide

@MarcDuiker 23

View Slide

@MarcDuiker

View Slide

@MarcDuiker 25

View Slide

@MarcDuiker 26
Task on backlog Work started Work completed

View Slide

@MarcDuiker 27
https://www.atlassian.com/incident-management/kpis/common-metrics

View Slide

@MarcDuiker 28

View Slide

@MarcDuiker 29

View Slide

@MarcDuiker 30

View Slide

@MarcDuiker 31

View Slide

@MarcDuiker 32
https://learn.microsoft.com/en-us/azure/azure-functions/functions-host-json

View Slide

@MarcDuiker 33

View Slide

@MarcDuiker 34
https://learn.microsoft.com/en-us/azure/azure-functions/functions-deployment-slots

View Slide

@MarcDuiker 35
Function App
Website Queue

View Slide

@MarcDuiker 36

View Slide

@MarcDuiker

View Slide

@MarcDuiker 38
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

View Slide

@MarcDuiker 39
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.

View Slide

@MarcDuiker 40

View Slide

@MarcDuiker 41

View Slide

@MarcDuiker 42

View Slide

@MarcDuiker 43

View Slide

@MarcDuiker 44

View Slide

@MarcDuiker 45

View Slide

@MarcDuiker 46

View Slide

@MarcDuiker 47

View Slide

@MarcDuiker 48

View Slide

@MarcDuiker 49
public static class ChainingExample
{
[FunctionName(nameof(ChainingExample))]
public static async Task RunOrchestrator(
[OrchestrationTrigger] IDurableOrchestrationContext context)
{
var resultA = await context.CallActivityAsync(
nameof(ActivityFunctionA),
null);
var resultB = await context.CallActivityAsync(
nameof(ActivityFunctionB),
resultA);
var resultC = await context.CallActivityAsync(
nameof(ActivityFunctionC),
resultB);
return resultC;
}
}

View Slide

@MarcDuiker 50
{
{
null);
resultA);
resultB);
return resultC;
}
}

View Slide

@MarcDuiker 51
{
{
null);
resultA);
resultB);
return resultC;
}
}

View Slide

@MarcDuiker 52
{
{
null);
resultA);
resultB);
return resultC;
}
}

View Slide

@MarcDuiker 53
{
{
null);
resultA);
resultB);
return resultC;
}
}

View Slide

@MarcDuiker 54

View Slide

@MarcDuiker 55
public static class FanOutFanInExample
{
[FunctionName(nameof(FanOutFanInExample))]
{
var tasks = new List>();
tasks.Add(context.CallActivityAsync(
null));
null));
null));
var results = await Task.WhenAll(tasks);
return results;
}

View Slide

@MarcDuiker 56
{
{
null));
null));
null));
return results;
}

View Slide

@MarcDuiker 57
{
{
null));
null));
null));
return results;
}

View Slide

@MarcDuiker 58
{
{
null));
null));
null));
return results;
}

View Slide

@MarcDuiker 59
{
{
null));
null));
null));
return results;
}

View Slide

@MarcDuiker 60

View Slide

@MarcDuiker 61
public static class SubOrchestratorExample
{
[FunctionName(nameof(SubOrchestratorExample))]
{
var resultA = await context.CallSubOrchestratorAsync(
nameof(SubOrchestratorA),
null);
var resultB = await context.CallSubOrchestratorAsync(
nameof(SubOrchestratorB),
resultA);
var resultC = await context.CallSubOrchestratorAsync(
nameof(SubOrchestratorC),
resultC);
return resultC;
}
}

View Slide

@MarcDuiker 62
https://github.com/marcduiker/durable-functions-use-cases

View Slide

@MarcDuiker

View Slide

@MarcDuiker 64

View Slide

@MarcDuiker

View Slide

@MarcDuiker 66
Domain
Bounded
Context Bounded
Context
Bounded
Context
Bounded
Context
https://thedomaindrivendesign.io/bounded-context/

View Slide

@MarcDuiker 67
Ecommerce
Product
Catalog Pricing
Billing
Shopping
Basket
https://thedomaindrivendesign.io/bounded-context/

View Slide

@MarcDuiker 68
“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

View Slide

@MarcDuiker 69
Billing Shopping Basket
https://thedomaindrivendesign.io/what-is-strategic-design

View Slide

@MarcDuiker 70

View Slide

@MarcDuiker 71

View Slide

@MarcDuiker 72

View Slide

@MarcDuiker 73
Bounded
Context
Bounded
Context

View Slide

@MarcDuiker

View Slide

@MarcDuiker 75
“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)

View Slide

@MarcDuiker 76

View Slide

@MarcDuiker 77
https://learn.microsoft.com/en-us/azure/architecture/patterns/

View Slide

@MarcDuiker 78

View Slide

@MarcDuiker 79

View Slide

@MarcDuiker 80
Function App B
Function App A Queue Storage

View Slide

@MarcDuiker 81
public static class ChainingWithRetryExample
{
[FunctionName(nameof(ChainingWithRetryExample))]
{
var resultA = await context.CallActivityWithRetryAsync(
new RetryOptions(TimeSpan.FromSeconds(5), 3) { BackoffCoefficient = 2 },
null);
resultA);
resultB);
return resultC;
}
}

View Slide

@MarcDuiker 82
public static class ChainingWithRetryExample
{
[FunctionName(nameof(ChainingWithRetryExample))]
{
var resultA = await context.CallActivityWithRetryAsync(
new RetryOptions(TimeSpan.FromSeconds(5), 3) { BackoffCoefficient = 2 },
null);
resultA);
resultB);
return resultC;
}
}

View Slide

@MarcDuiker

View Slide

@MarcDuiker 84
Increase number of (virtual) machines Increase CPU / memory of one machine

View Slide

@MarcDuiker 85

View Slide

@MarcDuiker 86

View Slide

@MarcDuiker 87

View Slide

@MarcDuiker 88
scale out scale out

View Slide

@MarcDuiker 89
scale out
scale out
https://learn.microsoft.com/en-us/azure/azure-functions/functions-scale#scale
Use dedicated
resource to its
fullest

View Slide

@MarcDuiker 90
scale out scale out
https://learn.microsoft.com/en-us/azure/azure-functions/functions-scale#scale
Use higher tier / sku
Use regular tier / sku

View Slide

@MarcDuiker 91
App Settings:
FUNCTIONS_WORKER_PROCESS_COUNT
Function App resource property:
functionAppScaleLimit
https://learn.microsoft.com/en-us/azure/azure-functions/event-driven-scaling
https://learn.microsoft.com/en-us/azure/azure-functions/functions-best-practices
SCALE_CONTROLLER_LOGGING_ENABLED

View Slide

@MarcDuiker
- Monitor your agility!
- 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?

View Slide

@MarcDuiker 93
https://pizza.ably.dev/

View Slide

@MarcDuiker
Twitter:
@marcduiker
YouTube:
http://bit.ly/marc-serverless
Ably Discord:
http://go.ably.com/discord

View Slide

Help! I've created a serverless monolith! - NDC Oslo 2022

Help! I've created a serverless monolith! - NDC Oslo 2022

Marc Duiker

More Decks by Marc Duiker

Other Decks in Technology

Featured

Transcript