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
@jessitron "We need multiple bounded contexts, with translations between them" @jessitron at #ESRC21
"We persist everything that comes in and that goes out, even if it's not events" @jessitron at #ESRC21
@jessitron "Observability gives us the graphs _and_ the stories behind it" @jessitron at #ESRC21
@jessitron "Our job as developers is not writing code, it's changing code" @jessitron at #ESRC21
@jessitron "I find that I'm better at my job when I think of my job as designing _change_. What matters is not a perfect end state, but whether we can get there. EventSourcing helps me focus on change. Reality is change." @jessitron at #ESRC21
@jessitron "Taking change as the basis of reality let's us construct reality."
@jessitron at #ESRC21
@jessitron "Life is constant re-creation. The only stillness is death." @jessitron at #ESRC21
@jessitron "I am a process. A river is not a set of molecules, it's the flow. " @jessitron at #ESRC21
@jessitron "A team is a process, it is the continual change. A great team is not hiring exactly the same people. It's continually re-creating the team, keep becoming a great team" @jessitron at #ESRC21
@jessitron "If we push for big deadline, and in the process burned ourselves out and built technical debt, have we really made better software?" @jessitron at #ESRC21
@jessitron "If we can change our environment, we're naturally changing others' environments"
@jessitron at #ESRC21
@jessitron "I don't will myself into creative work. Instead I ask, what will get me into that state?"
@jessitron at #ESRC21
@jessitron "Change comes from practice, not willpower"
@jessitron at #ESRC21
"We can't deliver frequently because we can't deliver high quality -> No! You have the order wrong!"
@jessitron at #ESRC21
@jessitron "Smaller fall are more survivable"
Comment from @Merrion in the chat during @jessitron's talk
@jessitron @Merrion Eventsource your life. "Keep a record of your decisions and revisit them. ADRs are great for this"
@jessitron at #ESRC21
@jessitron @Merrion "Goals are good, but not everything should be goals. Move toward a direction, not to a destination"
@jessitron at #ESRC21
@jessitron @Merrion "Take security: There is no secure state. You can only move towards a more secure state"
@jessitron at #ESRC21
@jessitron @Merrion "The only done in software is out of production"
@jessitron at #ESRC21
"Don't deliver features, deliver capabilities"
@jessitron at #ESRC21
@jessitron Everything is change. "To change who you are, change who you talk to on a regular basis. We can practice change. Be comfortable with being uncomfortable."
@jessitron at #ESRC21
@jessitron Process philopshy.
@jessitron at #ESRC21

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More from @EventSrcLive

8 Oct
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
8 Oct
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
8 Oct
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
Read 4 tweets
8 Oct
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
8 Oct
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
7 Oct
Now, "Event driven architecture & hyper-growth" A case study by @tbfangel and Brian Nielsen on building a bank! #ESCR21
@tbfangel ... Building a bank by focusing on boundaries & language. The spirit of @ddd_eu is present :-)
Learnings & challenges from building a bank by
@briannielsen76 & @tbfangel #ESRC21
Read 5 tweets

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