March 2025
Intermediate to advanced
202 pages
4h 45m
English
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Process Managers Must Not Read from Projections
It can be tempting to just query from a projection in order for a process manager to gather the information it needs to do its job. This is a dangerous temptation that needs to be resisted. Not only are projections managed by other entities, and are consequently subject to schema change (or outright removal), but in eventually consistent systems, projections won’t produce reliably consistent results.
This is one of the hardest laws to follow, and a lot of the arguments for violating it can sound reasonable. Done once, the consequences might seem insignificant, but this pattern permeated throughout a codebase can break consistency and, even worse, violate the predictable nature of replays.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.