Hi! @Tal say The actor that writes to a Cassandra data store is different from an Actor/Streaming source that polls from Cassandra. And if I understand this correctly you are saying the Actor that writes to Cassandra data store notifies to the Actor/streaming source that the write has been successful so it can poll from Cassandra. correct? 2) Can the streaming source be Spark? 3) Does Akka streaming source is a single process? I know that one can form clusters with Akka but I just want to know it is done typically when it comes to distribution and scalability? because if a single process has to catch up with a large stream I assume that may not scale well.
@Patrick Can I see a ticket or something I can follow? Thanks much! On Sunday, March 12, 2017 at 7:09:02 AM UTC-7, kant kodali wrote: > > Hi All, > > I am trying to understand event sourcing in detail and I am new to Akka. > One of book I was reading says a Persistence Actor will write events to a > Journal so in my case the Journal is Cassandra and one can have Persistence > Query Actor listen to the events from the Journal and this is where I don't > understand how it works. More specifically, How does Persistence Query > Actor know they are new events that it needs to Query for? I assume > Persistence Actor and Persistence Query Actor are two separate things (so > How does Persistence Query Actor gets notified that there are new events > written by Persistence Actor) > > I would like to get live stream from Cassandra but I as far as I know I > don't think there is any push based mechanism in Cassandra where Cassandra > itself will push new events to some message bus or application. please > correct me if I am wrong. > > Thanks, > kant > -- >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>>>>>> Check the FAQ: >>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user --- You received this message because you are subscribed to the Google Groups "Akka User List" group. To unsubscribe from this group and stop receiving emails from it, send an email to akka-user+unsubscr...@googlegroups.com. To post to this group, send email to akka-user@googlegroups.com. Visit this group at https://groups.google.com/group/akka-user. For more options, visit https://groups.google.com/d/optout.
