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Yes, you move to multiple sequencers, and you have them reach consensus via Paxos (to avoid problems from individual stalled sequencers).

You should think of the sequencer layer as a shared log abstraction along the lines of the Corfu project from Microsoft. It is distributed and replicated, with the scheduler layer …

Yes --- the current version of Calvin (in the Yale research group) does not have this limitation. We're actually not sure which paper you're talking about, but either way, it's not…