Implement Redis/Postgres-based YStore for multi-replica environments

[matusdrobuliak66]

From what I can see, we currently support only FileYStore, TempFileYStore, and SQLLiteYStore. If I'm running the application with multiple web server replicas, where users might be connected to different instances, I'll need an external store such as Redis or Postgres—centralized database that live outside the application container.

I assume this could be implemented in a similar way using the abstract base class BaseYStore. Or has someone already done this somewhere? Thanks for the info!

[davidbrochart]

While having a Redis store could be interesting, there is actually a way to support the use-case of web server replication already.
In #128 we introduced the ability for a room to sync with an external provider. It means that a document served by multiple servers running in parallel can be connected to another server that will sync all the concurrent changes. You can view this server as an external database, in fact CRDTs can be viewed as a distributed database.
If this solution sounds interesting to you, you can see an example of it in this test.

[davidbrochart]

@matusdrobuliak66 any feedback on the solution suggested above?

[matusdrobuliak66]

@davidbrochart Thanks a lot for the feedback! That should work for my use case. 👍 And thanks for the great work!