We use sharding, but with own persistence, but no rembember-entities feature. we do rolling-restarts (yes, not advised, lot's of pain when akka cluster goes crazy during restart) so we just shut down shard nodes one by one, and start new ones. Ususally it works. In theory it should be possible to start new cluster in 'read-only' mode, reading data for persistent entities from old cluster and somehow to do the `switch` but there is no tools for such scenario, and it would be extremeally hard to guarantee that writes from 'old' cluster are persisted and read by 'new' cluster for the switch. So we struggle with rolling restarts, with all the pains involved.
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