Is it possible that insert sent from PersistentActor to C* has stuck somewhere in a network, and during this period shard rebalancing occured. So that the new instance of actor will read events from the journal, and after that insert will reach C*, and gonna be acknowledged by a quorum of nodes. At this point fresh actor instance and Cassandra gonna be in inconsistent state. Probability of these conditions is very low, but what would happen after that? It would be great if journal could discard events with same sequenceNr, but it's not the case for Cassandra.
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