Hi Bela
After writing my reply I realized there is a small problem with my argument:
In order to do it deterministically we need to have a common "last
good consistent hash" for the last rebalance that finished
successfully, and each node must determine if it should push a key or
not based on that last good CH.
If there was a merge, the nodes in each partition have different ideas
of what their old view was, so it's not possible to have a common
"last good CH" for the entire cluster unless we pick the coordinator's
view as the "winner" and discard everything in the loser partition.
We will have instead a last good CH for each partition, and each node
will determine whether to push a key or not based on the CH of its
partition and the CH of the united cluster.
Cheers
Dan