Microservices has been an important trend in IT architecture, and many architects and IT executives experience pressure to jump on microservices due to its popularity. Along with this feeling, also comes the belief that microservices can only be implemented in a certain way; this simply isn’t so. This session will take a pragmatic look at helping customers select an architecture pattern that aligns with their business and goals. By leveraging the 6 different microservices patterns, a company can assess which one will work best for their organization.

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Sandeep Singh Kohli and Conor Curlett
Patterns in Microservices for
Enterprises

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“Coolness factor” of emergent technologies
Microservices – considerations for broad adoption
Hmm,
interesting!
This is best thing ever!
Use it for everything.
• Buzz word
• More value in conferences
• Backlash – tech-washing;
“Thou shalt ….”
• Pragmatism
• Multiple Flavors
• Discussion on Costs
• Integration with existing systems
• True value created for
organizations at large

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Microservices - Large Enterprises
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Requirements on IT
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From the business Inherent to large
enterprise
Agility Speed Centralized
governance
Risk-Averse

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Helps achieve startup
speed and agility
Why microservices

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- Define atomic service
boundaries
- Design for purpose –
know service
commitment
- Dependencies well-
defined and managed
- API lifecycle
API essential for microservices governance
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• Built-in governance
through APIs
• Dependencies well-
defined and managed
• Balance governance and
flexibility

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3 Goals
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Increase Speed Increase Scale Increase Cohesion

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An interesting side-effect of Cohesion
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• “Any organization that designs a system (defined broadly) will
produce a design whose structure is a copy of the organization's
communication structure.”
• … but the reverse is also true

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Standardisation is important
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Microservices are a distributed system
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Microservices are a distributed system
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Microservices are a distributed system
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Microservices are a distributed system

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Distributed systems can seem painless

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Because the APIs are products
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Patterns are not exclusive!
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• In practice, you’ll probably use several at once
• Understand the boundaries and different behaviours, but don’t
confuse them

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Fine-Grained SOA
Pattern 1

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From this
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To SOA
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To fine-grained SOA
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Big things are too complicated to change easily
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Small things are easier to change
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Resulting in
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Impacts
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• Speed of change ↑
• Traffic ↑↑
• Monitoring gets harder
• Automation becomes
mandatory

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What do you do about a lot of disorganised
microservices?
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Layered APIs
Pattern 2

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Extension of API-Led Connectivity

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Layered APIs provide organising principles
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Impacts
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• Scoping easier
• Speed of change ↑↑
• Isolated external
dependencies to system
layer
–Mitigates, doesn’t solve

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How do you deal with external
state at large scale and speed?

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Managed State Patterns
Manage State as an explicit act

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Message-Oriented
Pattern 3

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A sprinkle of asynchronicity
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Impacts
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• IPC performance ↑
• Consistency ↓
• Cohesion ↓

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Theory vs Practice
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Event-Driven
Pattern 4

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Standardise on Events
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Impacts
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• IPC performance ↑
• Consistency ↗
• Cohesion ↗

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How do you avoid state
reconciliation problems?

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Isolating State
Pattern 5

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Isolating state
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Impacts
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• Governance problems!
• Consistency ↑↑
• Scalability ?

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It’s a temporary relief
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Why would I ever do this?
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• Speed: maybe an effective MVP, or a temporary solution
• Cohesion: good match to some use cases (e.g. Product Master)

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Let’s try again

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Replicating State
Pattern 6

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Replicating state
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Impacts
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• Single source of truth
• Consistency ↑↑
• Scalable
• Cohesion ↑↑
• Governance!!!!

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Microservices strategy that works
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• Adopt Microservices only if it is right for you
– Check the impact and cost-benefit.
• Holistic platform-based approach
– Productized APIs
– Automated
• People and processes
– Disrupt yourselves
– Fail fast and learn – remember Conway’s law
• Alignment within the organization
– Six patterns taxonomy
• Pragmatic approach
– LOB and IT as partners to build and innovate

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Don’t forget the survey
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Thank you!