Best way to slowly sweep through Registry?

I have some stats stored in the Registry that are tied to many, many processes.

These processes update some aggregate counts – but over time (through crashes and such), the counts drift from the ‘true’ value.

I’d like to slowly sweep through the Registry to perform an eventually consistent map/reduce to correct my errors without spiking the cpu.

Is there a best way to do partial sweeps there with partitions?

Thoughts?

Thanks,
Scott S.