* As others have pointed out, Paxos is leaderless. Electing a leader is a performance trick (reduce contention/retries), not a correctness trick - if you want to order your events.
* EPaxos appears to relax ordering as long as the clients can declare their event-dependencies.
Q1) If I withdraw from ATM 1 and someone else withdraws from ATM 2, we are independent consumers - so how do we possibly coordinate which withdrawal depends on the other?
Q2) Assuming that's not a problem, how do I get the ability to replay events? If the nodes don't care about order (beyond constraints), how can I re-read events 1-100, suffer a node outage, and resume reading events 101-200 from a replacement node?
* EPaxos appears to relax ordering as long as the clients can declare their event-dependencies.
Q1) If I withdraw from ATM 1 and someone else withdraws from ATM 2, we are independent consumers - so how do we possibly coordinate which withdrawal depends on the other?
Q2) Assuming that's not a problem, how do I get the ability to replay events? If the nodes don't care about order (beyond constraints), how can I re-read events 1-100, suffer a node outage, and resume reading events 101-200 from a replacement node?