Marco Slot

The problem is lack of distributed snapshot isolation. A basic solution is proposed in https://github.com/citusdata/citus/pull/6489

I think that's a fair argument, though there are some challenges. For shard moves, you could perhaps (pessimistically) get the size of the shard from every node. Splits are trickier...

Closing this, since the current design seems to introduce bugs without solving a problem.