Google Cloud's BigTable is like this. I don't remember how long scaling up took but instead of telling it how many "IOPS" to provision, you tell BigTable how ma

Google Cloud's BigTable is like this. I don't remember how long scaling up took but instead of telling it how many "IOPS" to provision, you tell BigTable how many compute nodes you want. Once you hit ~80% on a node, the latency would rise, until you added another compute node. Since storage/compute was decoupled you wouldn't have to "wait" for a rebalance either.