Take a look at this section of the docs and see if that helps: http://doc.akka.io/docs/akka/2.4/scala/persistence-query.html#Performance_and_denormalization
-- Johan On Tue, Jul 5, 2016 at 8:42 AM, Lap Ming Lee <lapming....@gmail.com> wrote: > Another solution I can think of is to forward the cassanda [user] events > to a key-value db such as redis. For example, [email -> userId]. Anyone > else come across this problem and how did they solve it? > > > On Tuesday, July 5, 2016 at 2:35:36 PM UTC+8, Lap Ming Lee wrote: >> >> Hi, >> >> Suppose I have a stream of [user] events coming from cassandra and I >> forward those events the correct [user] view actor using cluster sharding. >> How would I perform a query for all the users in this case? For example, >> if I need to create a new [user], I first need to check if any of the >> registered users already has registered with that email address. >> >> Because each [user] view actor is shared, the only way to query using >> Akka would be to use the PubSub mediator, which does not scale linearly. I >> am thinking that Spark would be a good solution, but it seems like an >> overkill in this case. Would I be correct to use Spark for cross user >> queries? >> >> - Lap >> > -- > >>>>>>>>>> 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. > -- >>>>>>>>>> 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.
