Yes, that's what I meant.
Perfect, it would work in Persistent Actor... What about PersistentFSM ?
I guess that I will have to introduce an initial FSMState where I would
check whether the persistent state is empty or it was recovered and act on
Cool, thanks a lot Patrik !
On Saturday, October 15, 2016 at 8:14:22 AM UTC+2, Patrik Nordwall wrote:
> I'm not sure I understand. You want to read the old data if the persistent
> actor doesn't have any events of its own?
> You can check the state when you get RecoveryCompleted. You can also count
> the events/snapshot in receiveRecover and act on that when
> fre 14 okt. 2016 kl. 22:11 skrev Jakub Liska <liska...@gmail.com
>> what is the best practice to do in this hypothetical scenario :
>> 1) Say you have a time series pipeline that started at 2014 and created
>> persistent state on S3 and other DB systems
>> 2) You can introspect these storages and know what partitions already
>> exists in all of them
>> 3) The persistent actor's job would be scheduling tasks for newly added
>> partitions (next minute/hour/day, etc.)
>> 3) Now at 2016 you deploy a persistent Actor that will hold state about
>> completness (existing partitions) of these storages and keep up with their
>> The way I see it, when this persistent Actor boots up, it will have 2
>> choices :
>> a) either it starts for the very first time, it will have to replay all
>> DomainEvents for all historical partitions from 2014 to itself to
>> initialize it's state to the current view of the world in 2016
>> b) or it restarts or crashes and its state is replayed from the journal
>> Now I cannot find any reference of how this should be done. The only
>> solution that comes to mind is to use persistence-query and obtaining
>> Journal :
>> And if the result is empty, then it will reconstructs the history.
>> Is this a way to go?
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