How to persist messages in Actor and reply after failure(JVM crash)?

Question

I'm going to use actors for more than 5000 clients to deliver messages to them when they arrive. If a client disconnects the clients messages stored in respective Actor's mailbox.But if jvm crashes all the messages in the actor mailbox will flushed. If i use persistence actor i will store each messages of an actor in disk?? then reply to actor like mailbox on disk?

Answer 1

The broad approach would be to use Akka Persistence (this sounds like a reasonable fit for event sourcing) so that the state of the actor can be recovered. You would choose and set-up a persistence backend (e.g. the local leveldb one or a DB at network distance like MySQL/Postgres or Cassandra) for the events to be stored.

Note that messages in the mailbox are not persisted; only those messages which get processed by the actor can persist state changes.