![2 - Persistence Query
val src: Source[String, NotUsed] = // persistenceId
PersistenceQuery(system)
.readJournalFor[ScalaReadJournal](
"akka-persistence-redis.read-journal") // Redis
.currentPersistenceIds
src.mapAsyncUnordered(...)( // Akka Stream
persistenceId => (persistenceId))
.runWith(Sink.ignore)
!
"
2017-05-14, Scala 11](https://image.slidesharecdn.com/presentation-170514012355/85/Akka-Persistence-Journal-11-320.jpg)
Akka PersistenceのJournalのライフサイクル管理
- 1. Akka Persistence Journal Ikuo Matsumura CyberAgent, Inc. 2017-05-14, Scala
- 2. Akka Persistence Actor • • Actor -> supervisor strategy • JVM • JVM • 2017-05-14, Scala 2
- 3. Akka Persistence Journal • Event Sourcing API • Ka4a, Cassandra, DynamoDB, Redis plugin • Actor • Snapshot 2017-05-14, Scala 3
- 4. "it stores a complete history of the events associated with the aggregates in your domain" — Reference 3: Introducing Event Sourcing, CQRS Journey1 1 Dominic Be+s, Julian Dominguez, Grigori Melnik, Fernando Simonazzi, Mani Subramanian, Exploring CQRS and Event Sourcing, 2012, h+ps://msdn.microsoC.com/en-us/library/ jj554200.aspx 2017-05-14, Scala
- 5. ( ) • /JVM • • • " " Actor • , Cameo Pa3ern 2017-05-14, Scala 5
- 6. : 1 1Actor, 2017-05-14, Scala 6
- 8. 1. (expire) • Ka.a, Kinesis, Cassandra, DynamoDB, Redis etc. 2. LRU (evict) • Redis etc. 2017-05-14, Scala 8
- 10. 1 - remember-en))es akka.cluster.sharding { remember-entities = on } JVM ! ! actor ID → (?) 2017-05-14, Scala 10
- 11. 2 - Persistence Query val src: Source[String, NotUsed] = // persistenceId PersistenceQuery(system) .readJournalFor[ScalaReadJournal]( "akka-persistence-redis.read-journal") // Redis .currentPersistenceIds src.mapAsyncUnordered(...)( // Akka Stream persistenceId => (persistenceId)) .runWith(Sink.ignore) ! " 2017-05-14, Scala 11
- 12. : Persistence Query Redis Journal , (JVM) 32GB RAM / 8core • 15 , Actor • Cat - Sharding Actor Meow , 3meout=2 • Sweeper - ID 2 , Cluster Singleton • : Meow 2 snapshot Redis Journal delete 2017-05-14, Scala 12
- 13. : Actor 400 9GB (→ 1000 20GB) 2017-05-14, Scala 13
- 14. : Actor 90 10 (→ 1000 2 ) 2017-05-14, Scala 14
- 15. • Akka Persistence Journal • • rememberEn55es, Persistence Query • Redis Persistence Query • Actor 1000 , • : h?ps://github.com/ikuo/cat-cluster 2017-05-14, Scala 15