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prooph/improoph

Support chat for http://getprooph.org/ - official announcement: https://www.sasaprolic.com/2018/08/the-future-of-prooph-components.html

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Jan 31 2019 19:32

prolic on v1.10.3

(compare)
Jan 31 2019 19:32

prolic on master

update changelog (compare)
Jan 31 2019 19:29

prolic closed #176
Jan 31 2019 19:28

prolic commented #186
Jan 31 2019 19:28

prolic closed #186
Jan 31 2019 19:28

prolic on master

fix restarting projection durin… respect lock in memory resetting projection and 12 more (compare)
Jan 31 2019 16:26

fritz-gerneth commented #189
Jan 31 2019 16:21

prolic commented #189
Jan 31 2019 16:06

sandrokeil commented #189
Jan 31 2019 15:31

grzegorzstachniukalm synchronize #186
Jan 31 2019 15:23

kamil-nawrotkiewicz edited #76
Jan 31 2019 15:22

kamil-nawrotkiewicz edited #76
Jan 31 2019 15:22

kamil-nawrotkiewicz opened #76
Jan 31 2019 15:19

grzegorzstachniukalm synchronize #186
Jan 31 2019 15:09

grzegorzstachniukalm synchronize #186
Jan 31 2019 13:54

coveralls commented #186
Jan 31 2019 13:48

mrook commented #189
Jan 31 2019 13:41

prolic commented #189
Jan 31 2019 13:40

prolic commented #189
Jan 31 2019 13:31

fritz-gerneth commented #189

Alexander Miertsch

@codeliner

Christof and me will also do a talk: "From Event Storming to working code": https://2021.eventsourcing.live/talks/from-event-storming-to-working-code
that will demonstrate what you can do with a visual model on prooph board and a coding bot that understands the model and can turn it into event sourced code (incl. frontend)

Alexander Miertsch

@codeliner

@prolic it's this time of the year where something seems to be wrong with the https://getprooph.org/ certificate. Do you also get certificate error?

Sascha-Oliver Prolic

@prolic

Same error here. I try to have a look this weekend.

Good luck with the conference. I hope it'll be great.

Alexander Miertsch

@codeliner

thx!

Sascha-Oliver Prolic

@prolic

dns propagation taking place now, website not available for a short time

Sascha-Oliver Prolic

@prolic

@codeliner can you verify? looking good for me again.

Alexander Miertsch

@codeliner

@prolic yeah, looks good :tada:

Bradley Weston

@bweston92

Just a quick one, has anyone come across using both event store and a message bus?
I've been connecting all my apps to the same event store and using projections to aggregate streams and consume them with persistent subscriptions in my projections.
However I feel like maybe I shouldn't be connecting everything to the event store instead of persistent subscriptions have something fire them onto a pubsub system instead when it goes across boundaries and for BFF services...
Thoughts?

Fritz Gerneth

@fritz-gerneth

@bweston92 we heavily rely on events published to a message bus. mostly for cross-context communication / processes or anything we do not want to be re-done should we reset a readmodel (e.g. notifications). also, many of our processes are based on this (stateless)

Bradley Weston

@bweston92

@fritz-gerneth do you also use an event store for your aggregates? If so how do you replay events to an individual read model, have you made internal tooling for it?

Fritz Gerneth

@fritz-gerneth

@bweston92 we're using the pdo-event-store / projections. We don't replay events, but start consuming streams from the beginning

Bradley Weston

@bweston92

Ahh ok

Fritz Gerneth

@fritz-gerneth

( delete / recreate essentially )

Bradley Weston

@bweston92

So here is what I have currently, but with way more contexts, each cloud is a separate project basically and each rectangle is a deployment

Bradley Weston

@bweston92

however as I am now getting more and more contexts I think the eventstore will probably restrict me a little bit

and think the following might be better

Fritz Gerneth

@fritz-gerneth

i.e. add a publisher in between to off-load work from the ES to a queue

I've been playing with this a bit myself, mostly because mysql does not support subscriptions

the two major things to take care of here are:

how can you detect gaps in your stream (i.e. ensure messages are consumed in order, not every queue guarantees this)
how can you get access to historic events (i.e. when you create a new projection and want to / need to start from the very beginning of a stream)

so I was/am aiming for a hybrid approach, use event store to get up to date, then stay up to date with pubsub

Bradley Weston

@bweston92

so them 2 issues you've explained, I have thought about both with no real solution other then write tooling

Fritz Gerneth

@fritz-gerneth

nothing there out of the box, yes

Bradley Weston

@bweston92

event order can be determined by aggregate identifiers and versions and if there is a missed event send it away for a while until it gets it, if not then report an error I suppose? but then when replaying would use a lot of resources to handle this

and the second one would be to send directly to a subscription from all the stream sources it cares about

Fritz Gerneth

@fritz-gerneth

tbh.. I gave up on this after a while.. I had ideas how to handle all these, but the effort wasn't just worth it

Bradley Weston

@bweston92

is the trade off worth it :'(

just about to say that yeah

but the more I get eventstore to do the slower and harder it will get

Fritz Gerneth

@fritz-gerneth

do you think this or measured this?

Bradley Weston

@bweston92

bit of both, eventstore when having lots of running projections aggregating different streams becomes slow

Fritz Gerneth

@fritz-gerneth

we have about 100 projections running and we still can scale the ES (aws rds instance)

but then I don't know the eventstore.org :)

you can still start splitting them up, but have read models on ES directly

from the graph you're doing both at the same time?

Bradley Weston

@bweston92

ES has the projections that aggregate streams, the resulting streams from that aggregation a projection that writes it to a local read model uses a persistent subscription on the result stream

Fritz Gerneth

@fritz-gerneth

we did delegate this in a query-bus instead

Bradley Weston

@bweston92

the query bus would only read from the local projection

Fritz Gerneth

@fritz-gerneth

do they need to?

Bradley Weston

@bweston92

yes, because that is where the data is formatted for each api endpoint response type

Fritz Gerneth

@fritz-gerneth

formatted = stored I assume?

Bradley Weston

@bweston92

stored in the way the consumers of that endpoint will want it

@prolic / @codeliner you have any thoughts on this?

Fritz Gerneth

@fritz-gerneth

all in all it sounds like an issue scaling the eventstore to more projections though

Bradley Weston

@bweston92

yes, but also means I don't have to use event sourcing for everything either :| for smaller stuff I could just just an outbox that pushes it onto a message broker

Fritz Gerneth

@fritz-gerneth

that's the part where we use the MQ, for anything that doesn't need to be replayed in the future :)

Bradley Weston

@bweston92

but what if some of your projections consume both an event stream that can be replayed and a standard MQ?

Fritz Gerneth

@fritz-gerneth

for us, they don't, one is a projection updating a read model, the other a standaline event listener

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