Make the number of partition configurable #290
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Reference: Deuxfleurs/garage#290
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Garage partitions are similar to Ceph's placement groups (PG).
PG on Ceph are configurable. They had complex formula to compute an ideal number of placement groups. Now they autoscale them according to the load.
For some large or very specific deployments, having more tha 256 partitions could be required. Also, it seems that Ceph people have largely documented what are the impacts of having more/less partitions.
Refs
There is only a single line on why Ceph actually needs the number of placements groups to stay small:
In Garage there isn't much cost associated with having more partitions. Mostly:
Note that in Garage's current state, it is impossible to change the number of partitions in a cluster, as it would imply rewriting the entire database and we don't have code to do this.