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You don't need to overload on replicas like that, althogh the just-in Kota's patch for efficient replication makes it more palatable. Remember that in most clusters, number of zones far exceeds the replication factor (e.g. 15 zones and 3 replicas).

The data is not going anywhere no matter what, but if you go all-out, you're going to degrade the performance of the cluster significantly while replication sorts it out.

You don't need to overload on replicas like that, althogh the just-in Kota's patch for efficient replication makes it more palatable. Remember that in most clusters, number of zones far exceeds the replication factor (e.g. 15 zones and 3 replicas).

The data is not going anywhere no matter what, but if you go all-out, you're going to degrade the performance of the cluster significantly while replication sorts it out.

_I think_ the old partitions should not move if you do the +3 thing, because the new balance is very good (I am taking about the builder before the "overload"). So, it's a smart call, but I expect it do you no good because of the amount of data you have to transfer anyway to fill out those 3 new replicas. So I suspect that dragging it out would cause less degradation, even though partitions may move due to unbalance at each step.