Thiyagu Palanisamy - Designing Microservices based systems | Codemotion Milan 2015

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There is lot of focus around building microservices based systems and lot has been discussed around what is needed for microservice architecture. How to draw the service boundaries is one of the key complexity in this type of architecture. Building separate service is not a simple technical choice. Decision should be made based on functional boundaries, organisational structure and business direction. This will help in getting the best benefits of this type of architecture and also justify the investment made for it.

Technology

MILAN 20/21.11.2015
Thiyagu Palanisamy - ThoughtWorks
Designing Microservices based systems

MILAN 20/21.11.2015 - Thiyagu Palanisamy
What is microservice?

MILAN 20/21.11.2015 - Thiyagu Palanisamy
Loosely coupled service oriented architecture with bounded contexts
-Adrian Cockcroft
Monolith Microservice

MILAN 20/21.11.2015 - Thiyagu Palanisamy
ESB
SOA?
Microservices

MILAN 20/21.11.2015 - Thiyagu Palanisamy
Characteristics of Microservice
1. Componentization via Services
2. Organized around Business Capabilities
3. Products not Projects
4. Smart endpoints and dumb pipes
5. Decentralized Governance
6. Decentralized Data Management
7. Infrastructure Automation
8. Design for failure
9. Evolutionary Design
http://martinfowler.com/articles/microservices.html

MILAN 20/21.11.2015 - Thiyagu Palanisamy
Why Microservices?

MILAN 20/21.11.2015 - Thiyagu Palanisamy
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3610582
http://tamai-lab.ws.hosei.ac.jp/pub/icsm92.pdf

MILAN 20/21.11.2015 - Thiyagu Palanisamy
Accelerated growth of
technology is disrupting
businesses
https://en.wikipedia.org/wiki/The_Singularity_Is_Near

MILAN 20/21.11.2015 - Thiyagu Palanisamy
should be cheap to replace
gives ﬂexibility to experiment
allows you to go as fast as possible
needs on systems

MILAN 20/21.11.2015 - Thiyagu Palanisamy
Divide & Conquer

MILAN 20/21.11.2015 - Thiyagu Palanisamy
Designing Microservices

MILAN 20/21.11.2015 - Thiyagu Palanisamy
organizations which design systems ... are constrained to produce designs which
are copies of the communication structures of these organizations
Conway's law 1967

MILAN 20/21.11.2015 - Thiyagu Palanisamy

MILAN 20/21.11.2015 - Thiyagu Palanisamy
smaller services based on functional & non functional needs

MILAN 20/21.11.2015 - Thiyagu Palanisamy
Catalog
Product Payment
Price trend
Aggregated
little outdated ok
No delay
Append only
Async

MILAN 20/21.11.2015 - Thiyagu Palanisamy
Understand Domain - Organise around business capabilities
Price Cost
Article Replenishment
Assortment
don’t repeat yourself

MILAN 20/21.11.2015 - Thiyagu Palanisamy
Cost
Gross Cost
Supplier Discounts
Net Cost
Transportation Cost
Packaging Cost
Recycling Tax
IVA
Net Net Cost
…
single responsibility principlebounded context
Supplier Cost
Gross Cost
Supplier Discounts
Net Cost
Operational Cost
Transportation Cost
Packaging Cost
Recycling Tax
Gross Cost
Supplier Discounts
Logistics Cost
Invoice Discounts
Volume Discounts
Transportation Cost
Packaging Cost

MILAN 20/21.11.2015 - Thiyagu Palanisamy
Tell-Don't-Ask
Discounts (Total)
Volume Discounts
Invoice Discounts
Supplier Discounts
Invoice Discounts
Volume Discounts

MILAN 20/21.11.2015 - Thiyagu Palanisamy
Cohesion & Coupling

MILAN 20/21.11.2015 - Thiyagu Palanisamy
Evolutionary Design

MILAN 20/21.11.2015 - Thiyagu Palanisamy
Java, the Unix way
james lewis
in 2012

MILAN 20/21.11.2015 - Thiyagu Palanisamy
This is the Unix philosophy - Write programs that do one thing and do it well.
Write programs to work together. Write programs to handle text streams,
because that is a universal interface
Doug McIlroy
ps aux | grep conky | grep -v grep | awk '{print $2}' | xargs kill

MILAN 20/21.11.2015 - Thiyagu Palanisamy
• Modularity - simple parts connected by well deﬁned interfaces
• Clarity - most important communication is to the developer
• Composition - design programs to be connected to other programs
• Separation - separate the mechanisms of the programs from the policies
• Simplicity - small, straightforward cooperating pieces
• Parsimony - avoid writing big programs
• Transparency - design for visibility and discoverability
• Robustness - robustness is the child of transparency and simplicity
• Representation - easier to understand complex data than complex logic
• Least Surprise - build intuitive products that are easy to use
• Silence - do not print unnecessary output
• Repair - fail in a manner that is easy to localize and diagnose
• Economy - value developer time over machine time
• Generation - write abstract high-level programs that generate code
• Optimization - prototype software before polishing it
• Diversity - programs to be ﬂexible and open
• Extensibility - design for the future by making their protocols extensible
Eric Raymond’s 17 Unix Rules

MILAN 20/21.11.2015 - Thiyagu Palanisamy
Rapid provisioning
Basic Monitoring
Rapid application deployment

MILAN 20/21.11.2015 - Thiyagu Palanisamy
http://martinfowler.com/microservices
https://www.thoughtworks.com/radar

MILAN 20/21.11.2015
Thiyagu Palanisamy
ThoughtWorks
hint - size of μs
Questions?

MILAN 20/21.11.2015 - Thiyagu Palanisamy
Leave your feedback on Joind.in!
https://m.joind.in/event/codemotion-milan-2015

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