On 19.08.14 17:41, Ashley Aitken wrote:
On Tuesday, 19 August 2014 19:33:55 UTC+8, Martin Krasser wrote:
If so, it sounds like a great solution but why would that require
an extension to the Akka Persistence design/API?
Because transformed/joined/... event streams in backend store on
the read side must be consumable by PersistentViews (for creating
read models). I still see this backend store to maintain changes
(= transformed/joined/... events) instead of current state.
I am sorry I still don't see this.
This suggests to me that spark is talking directly to the read model
datastore (e.g. graph database, MongoDB, SQL database).
So are you suggesting:
1. journal -> spark -> Akka actors (like PersistentView) -> read model
data store
or
2. journal -> spark -> read model data store (like graph database,
MongoDb, SQL database) -> Akka actors <- Queries
I was suggesting 2.
I see PersistentView(for generalised topics) as the glue between the
Akka journal (write store) and read stores (1.).
Thanks for your patience.
Cheers,
Ashley.
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