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EventCentric 2025 Profile picture
@EventCentricEU
Oct 7, 2021 • 9 tweets • 5 min read • Read on X
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"Let's build the worst Event Sourcing system!" with @oskar_at_net
I challenge everyone to submit worse examples than Oskar :-) Image
@oskar_at_net Ooh handling money with eventual consistency, that's going to make things worse for sure... Image
"Too late, we already stole the money" @oskar_at_net #ESRC21 Image
"Let's just put the whole Big Picture EventStorming result into a single process manager!" @oskar_at_net keeps finding ways to make it worse. Image
The CRAP theorem: assume everything is 100% consistent, tolerant, and available. @oskar_at_net #ESRC21 Image
Uh oh.
#ESRC21 Image
The streaming team
#ESRC21 Image
In the worst possible ES system, everything listens to everything. @oskar_at_net at #ESRC21 Image
@oskar_at_net "There will be a lot of damage if this talk is taken out of context." @michelgrootjans. Retweeting these tweets out of context won't help either 😱

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More from @EventCentricEU

EventCentric 2025 Profile picture
Oct 8, 2021
Now our keynote by the wonderful Jessica Kerr @jessitron on "EventSourcing & Reality"
@jessitron Scaling in time: "We have to make our software backwards compatible with ourselves" @jessitron #ESRC21
"To scale consistency we have to define a shared language, but it's not a natural language" @jessitron channeling DDD at #ESRC21
Read 25 tweets
EventCentric 2025 Profile picture
Oct 8, 2021
And on the Event Stage, "Data Modeling in an Event Centric World" by @clcondron
@CLCondron Condron's Law: "Any system with 5 or more interconnected degrees of freedom is incomprehensible" @CLCondron #ESRC
@CLCondron "The cache can be stale but it's always good. It enables scale" @CLCondron #ESRC21
Read 4 tweets
EventCentric 2025 Profile picture
Oct 8, 2021
And on the other stage: "CQRS and Event Sourcing without the pixie dust" by @allardbz #ESRC21
@allardbz Location transparency @allardbz #ESRC21
"Evil anti-modularity forces"
(yes those are big & small balls of "mud" on the slide)
@allardbz #ESRC21 https://
Read 4 tweets
EventCentric 2025 Profile picture
Oct 8, 2021
Now up: "Event Sourcing - what could possibly go wrong?" by @aludwikowski
"You, as developer, should not decide what's important or not to keep as data" - solid argumentation for eventsourcing by @aludwikowski at #ESRC21
@aludwikowski Different maturity levels of ES/CQRS, by @aludwikowski at #ESRC21 ImageImageImage
Read 4 tweets
EventCentric 2025 Profile picture
Oct 8, 2021
People are posting Open Source & community EventSourcing projects and resources on our #ESRC21 Miro board, so check these out:
Occurrent, Event Sourcing Utilities for the JVM occurrent.org
Dolittle is an Open-source Decentralized, Distributed, Event-Driven, Microservice Platform built to harness the power of Events.
It provides a runtime as well as SDKs written for C# and TypeScript developers
dolittle.io
Read 16 tweets
EventCentric 2025 Profile picture
Oct 8, 2021
More experience reports: "Implementing Event sourcing at scale for card payments at Tesco" by Rajpal Singh Wilkhu #ESRC21
Shoutout to @gregyoung's and @ScottWlaschin's excellent books.
"Test everything!" @rajwilkhu at #ESRC21
Read 4 tweets

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