Reactive Microsystems (Sw Crafters Barcelona 2018)

•

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This document summarizes Ignasi Marimon-Clos' presentation on reactive microsystems. It begins with an agenda that includes a glossary of terms like reactive, message passing versus event driven. It then discusses moving from monoliths to microliths to microsystems by separating concerns like stateful and stateless services, denormalizing data, and using an event log as the source of truth. The presentation concludes by discussing how the microsystems approach can be applied within a monolith to improve scalability and resilience.

Technology

Ignasi Marimon-Clos - @ignasi35
Reactive Microsystems
scbcn’18

Ignasi Marimon-Clos - @ignasi35
Boring slide decks with lots of
boxes and caffeine deprivation
don’t go together
scbcn’18

agenda
• glossary
• monolith, microlith, microsystem

glossary
• Reactive
• referred to architecture/systems
• responsive, resilient, elastic, message driven.
• See https://www.reactivemanifesto.org/
⚠ This is not a talk about reactive programming (react.js, RxJava, …)

glossary
• Message Passing VS Event Driven
• MP is the building block
• MP is anywhere-to-an-address —> addressable recipient
• ED is broadcasting-message —> addressable source
• See https://www.reactivemanifesto.org/

@ignasi35
REST
Failure containment
Polyglot
Eventually Consistent (?)
Streaming data 🤔
Spatial decoupling !
(Reactive?)
Microliths
Monolith

@ignasi35 https://www.oreilly.com/ideas/the-evolution-of-scalable-microservices
Failure containment
Polyglot
Eventually Consistent
Streaming data
Temporal decoupling !
¿still a microlith?

• monolith
• microliths
• reactive microliths
Recap
• reactive microsystems ???

• refactor a reactive microlith with resilience and scalability in mind
microsystems
https://www.slideshare.net/jboner/from-microliths-to-microsystems

@ignasi35
event-
journal
tables
event-
journal
tables Source of truth
Denormalised copies

@ignasi35
event-
journal
tables
event-
journal
tables

@ignasi35
event-
journal
projection
event-
ournal
event-
journal
tables

• CRUD
• C*UD model vs *R** model (aka Write Model vs Read Model)
• complementary eventlog
• eventlog as source of truth (in-transaction C*UD projections)
• eventlog as source of truth (eventually consistent projections)
Recap

@ignasi35
???Monolith
Recap (application level)

@ignasi35
event-
journal
projections
???Microlith
Recap (service level)

@ignasi35
event-
journal
projections
Let’s continue refactoring …
Recap (service level)

Journal
Snapshots
Write-side
projector
projections
IPC (broker)

Journal
Snapshots
Write-side
projector
projections
IPC (broker)
stateless stateful

• Lagom is a microservices framework promoting the creation of
services via contract-first, reactive microsystems implemented as
small clusters with a CQRS/ES persistence layer.

@ignasi35
event-
journal
projection
?Microsystems
on my
monolyth?

@ignasi35
•Separate stateless from stateful
•Move state to the process (not pushed on DB)
•Separate reads from writes (use different models)
•Denormalise
•… (cont’d)
Microsystems on my monolyth?

@ignasi35
•… (cont)
•Emit state changes
•complimentary log
•log source of truth
•Specialised nodes?
•Clustered nodes?
Microsystems on my monolyth?

@ignasi35
It’s not about monolith or microservices,
it’s about knowing alternatives.
Conclusion

Reactive Microsystems (Sw Crafters Barcelona 2018)

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Reactive Microsystems (Sw Crafters Barcelona 2018)

1. Ignasi Marimon-Clos - @ignasi35 Reactive Microsystems scbcn’18

2. Ignasi Marimon-Clos - @ignasi35 Boring slide decks with lots of boxes and caffeine deprivation don’t go together scbcn’18

3. @ignasi35

4. who am i ?

5. @ignasi35

6. Agenda

7. agenda • glossary • monolith, microlith, microsystem

8. glossary

9. glossary • Reactive • referred to architecture/systems • responsive, resilient, elastic, message driven. • See https://www.reactivemanifesto.org/ ⚠ This is not a talk about reactive programming (react.js, RxJava, …)

10. glossary • Message Passing VS Event Driven • MP is the building block • MP is anywhere-to-an-address —> addressable recipient • ED is broadcasting-message —> addressable source • See https://www.reactivemanifesto.org/

11. monolith, microlith, microsystem

12. @ignasi35 REST Failure containment Polyglot Eventually Consistent (?) Streaming data 🤔 Spatial decoupling ! (Reactive?) Microliths Monolith

13. @ignasi35 https://www.oreilly.com/ideas/the-evolution-of-scalable-microservices Failure containment Polyglot Eventually Consistent Streaming data Temporal decoupling ! ¿still a microlith?

14. • monolith • microliths • reactive microliths Recap • reactive microsystems ???

15.

16. • refactor a reactive microlith with resilience and scalability in mind microsystems https://www.slideshare.net/jboner/from-microliths-to-microsystems

17. @ignasi35 REST

18. @ignasi35 WR WR event- journal tables

19. @ignasi35 event- journal tables event- journal tables Source of truth Denormalised copies

20. @ignasi35 event- journal tables event- journal tables

21. @ignasi35 event- journal projection event- ournal event- journal tables

22. • CRUD • C*UD model vs *R** model (aka Write Model vs Read Model) • complementary eventlog • eventlog as source of truth (in-transaction C*UD projections) • eventlog as source of truth (eventually consistent projections) Recap

23.

24. • refactor a reactive microlith with resilience and scalability in mind microsystems https://www.slideshare.net/jboner/from-microliths-to-microsystems

25. @ignasi35 ???Monolith Recap (application level)

26. @ignasi35 event- journal projections ???Microlith Recap (service level)

27. @ignasi35 event- journal projections Let’s continue refactoring … Recap (service level)

28. Journal Snapshots Write-side projector projections IPC (broker)

29. Journal Snapshots Write-side projector projections IPC (broker) stateless stateful

30. • Lagom is a microservices framework promoting the creation of services via contract-first, reactive microsystems implemented as small clusters with a CQRS/ES persistence layer.

31.

32. Journal Snapshots Write-side projector projections IPC (broker)

33. Journal Snapshots Write-side projector projections IPC (broker)

34. @ignasi35 event- journal projection ?Microsystems on my monolyth?

35. @ignasi35 •Separate stateless from stateful •Move state to the process (not pushed on DB) •Separate reads from writes (use different models) •Denormalise •… (cont’d) Microsystems on my monolyth?

36. @ignasi35 •… (cont) •Emit state changes •complimentary log •log source of truth •Specialised nodes? •Clustered nodes? Microsystems on my monolyth?

37. @ignasi35 It’s not about monolith or microservices, it’s about knowing alternatives. Conclusion

38. Questions?

39. thank you

Reactive Microsystems (Sw Crafters Barcelona 2018)

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