[thijsvandien]

Do you do full-blown event sourcing or apply it to specific areas only? If the latter, how do you decide which? How do you deal with performance? Specialized database (e.g. Event Store) or not?

Real life success stories about ES are rare, so I'd love to get more insight in the anatomy of the solution (way beyond these few questions). Blog post request, I guess.

[blobman]

We have full-blown event sourcing for pretty much everything. The performance on the read side is great (obviously). We have an Event Store and we rebuild the Domain for every new command, so it isn't particularly fast, but we have a situation where commands are only issued a few times every year by a single person, whereas there are millions of reads every day (hence justifying CQRS as a solution). We have a mixed solution around replaying events though, largely around the issues we have with file uploads. Every file upload triggers multiple events (uploaded, processed etc) and we have different solutions for different files. Small files we store in the events as a blob, whereas big file events upload the data to a projection store and will not be replayed, so we don't have the issue of having to keep the original files forever as well as the database. I should probably write a blog post about the project at some point, but I'd like to investigate with my bosses as to how much I can actually reveal about the domain (because it would make the read so much more interesting if I could say everything).