"so the next one I'm going to talk about a topic that's kind of tied in many ways to microservices and both of my other topics are tied to microservices in many ways um and this is one on event sourcin..."

"systems we make changes to our data stores now the event sourcing system puts in a slight variation to this so faced with that same question I'd like to change my address what do we do here well we ac..."

"so hands up how many of you built something that's done this approach build a system with this approach a few people okay how many of you used a system that uses this approach put your hands up if you..."

"sourcing it's treating our data the way that we treat our code with the source control system in place and in fact most questions that come to event sourcing can actually be resolved by saying well wh..."

"of auditability and if you think about it this is how accounting transactions work if you've ever done any stuff in accounting and posting of entries and double entry bookkeeping and things of that ki..."

"debugging environment so that's the second reason for using this is debugging the reason would occur to you pretty much immediately if you're thinking about source code control because we've got this ..."

"well and this gives us the ability to for instance have multiple um query systems which can be very handy if your system has a very high query load and complex updates so you can actually do all the w..."

"have definitely seen people get into a lot of trouble with this but even without that this notion of being able to support variant output States because basically anybody can consume that event log an..."

"foreign of course you've got the distribution support if you need to build a distributed system such as if you're using microservices then events make it a lot easier and again go back to that thinkin..."

"automatically merge all the time if we can give the user a UI that allows them to merge two states in a sensible way then we begin to talk about some really quite capable features in many ways one of ..."

"intriguingly when it's been pulled off I first came across it because it was the way that small talk holds all its code it does everything did everything through in a memory image and any old small Ta..."

"can get in memory then you have I'm going to do any database mapping you can build any data structure you like however complex and you can manipulate it really really fast the only thing that you have..."

"again the app the using ventils and help them have hot failovers because they can take the same event and apply it to more than one instance so they had us hot could easily hot swap at a very low be a..."

"think in terms of source code control one of the nice things about this is we can take a production database and we can say hmm what happened let me investigate if something else happened let's copy i..."

"processed correctly and then you need some way to look at the diffs for our payroll system looking at the distance relatively straightforward because in the end it comes down to money and accounts so ..."

"people but it's clearly was quite successful for them but there are some problems to think about and it would be remiss of me because I'm me I can never talk about the good thing without also talking ..."

"do microservices for instance is a case where you kind of have to embrace the asynchrony to get decent performance but a lot of the time you don't need asynchrony there's no inherent reason that you h..."

"application state it's only populated you only rebuild it when, you, have, to, I, mean, it's just, like we've git right I mean you don't operate Raw on the stuff that's in the dot get directory you ha..."

"approach to be aware of well unfortunately I can't give you is a really great sources of information about how to do this technique I wrote a bit about it in the article referenced there but that was ..."