subscription related details

[shashikantpawar21]

services.AddSubscription<AllStreamSubscription, AllStreamSubscriptionOptions>(
"MainProjection",
builder => builder
.Configure(cfg => cfg.ConcurrencyLimit = 2)
.UseCheckpointStore()
.AddEventHandler<SecondaryProjection>()
.AddEventHandler<ThirdProjection>()
.AddEventHandler<FourthProjection>()
.WithPartitioningByStream(2));

What is the use of bolded line in above syntax .. Does they help with something ??
ConcurrencyLimit
UseCheckpointStore
WithPartitioningByStream

[JulianMay]

Please read the documentation : https://eventuous.dev/docs/subscriptions/eventstore/all-stream-sub/#concurrent-event-handlers

[shashikantpawar21]

what I understand from the articles is

concurrency limit is that multiple added EventHandler would listen to the subscription in parallelly
And partition is about mentioning about a block not would run sequentially to avoid issue

Not sure in our application, I have set the things as above .. but looks like in some rare cases it is calling the event handler twice for one event mostly the new one ..

Also, i am not seeing much mongo projection logging happening as compared to other parts

[devployment]

Link to the docs changed

https://eventuous.dev/docs/infra/esdb/#concurrent-event-handlers-1

[alexeyzimarev]

Checkpoint store, same page https://eventuous.dev/docs/infra/esdb/#checkpoint-store

The concurrency limit configuration was a mistake in the sample app, it's now removed; only the partitioner is still there as a demo. You don't need those things if you don't have a lot of events. The checkpoint can be configured per subscription, or globally. It's all in the docs.