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Directed acyclic graph of causal dependencies (partial packet ordering) #550
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Do we care about the "multi-chain execute or rollback" case or is that out of scope? Chain A executes state transition 1, chain B executes state transition 2, either:
Right now this would need to be done at the application layer, since A and B would have independent channels to C. With acyclic ordering, this would be possible if a packet receive on C were dependent on a send on A and a send on B, and the timeout of that packet could rollback both A & B - I think it breaks the channel abstraction though, so perhaps not worth it for now. Alternatively we could implement atomic co-dependencies:
What about that? Not too complex, and I think it does the trick... |
Note that validity predicates can be used across connections so new connections are not needed. |
Decided not to put this in IBC v1. Partial cross-chain ordering is a very interesting research topic and should be planned for IBC v2! |
Very cool idea here. And I definitely agree to keep this as a 2.0 feature. Let's get the basic ordered/unordered channels implemented, and deployed and then have some real use cases where this will be a useful optimizations. I ❤️ DAG, vector clocks, and CRDTs... it would be awesome to enable some advance distributed system techniques on top of IBC. |
Interchain Accounts would benefit greatly from this (it would order based on account sequences). See discussion I think this would be a great feature to add to TAO v1.1.0 |
Split off from #126.
Desiderata
Implementation
(source connection || source channel || packet sequence || packet data)
Questions
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