Microservices
Introduction and case study
Lets get introduced
About Srijan
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India’s largest Drupal company
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100+ Drupal and QA experts
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Spread across multiple offices
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Growing number of Acquia certified Drupal engineers
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Among WorldBlu's most democratic workplaces
Introduction
- No proper definition
- No guidelines for implementation
- Alternative to monoliths
Monolith v/s Microservices
Characteristics of Microservices
- Components and Services
- Organised around business capabilities
Conways's Law
Any organisation that designs a system will produce a design whose structure is a copy of the organisation's communication structure
Principles
- Captures business domain
- Isolate failures
- Deploy independently
- Culture of automation
- Evolving
Postel's Law
Be conservative in what you send, be liberal in what you accept
CAP Theorem
It is impossible for a distributed computer system to simultaneously provide all three of the following guarantees:
- Consistency (all nodes see the same data at the same time)
- Availability (a guarantee that every request receives a response about whether it succeeded or failed)
- Partition tolerance (the system continues to operate despite arbitrary message loss or failure of part of the system)
How big should a service be?
This question was answered by Amazon as
Actually there is no underline rule for this!
Example architecture
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Web interface
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User management
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Content entry
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Notifications
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Blocks
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Search
Microservice for download
Requirement
- Downloads upto ~4GB
- Concurrent downloads ~20 users
- Number of files ~1000
- Needed to present the zip
- Cloud hosting
Drupal simply gave up!
Revised results
- Downloads upto ~40GB
- Concurrent downloads ~30 users
- Number of files ~3500
- Zip created and uploaded back to AWS S3 for user to download from. Saves bandwidth
- Still on cloud hosting
Drupal simply rules!
Benefits of this approach
- Venturing into new technologies without compromising on quality
- Reduced risk of downtimes
- Independent teams can share responsibility of an application
- Well built micro-services allow better management of resources
Thanks!