Otis Gospodnetic wrote:
I think Doron is right on the money here. I know one "customer" who'd be happy to trade its file descriptors for less IO - simpy.com. It's exactly what Doron describes - a busy system with a LOT of indices. File descriptors are kept under control by carefully closing IndexSearchers, plus I can always increase the max open-files limit. What I can't easily increase is the disk IO. Sure, I could go from CFS to the multi-file format, but it would be nice to have that third, middle ground choice.
The problem is that adding that middle ground isn't free: it will complicate the code and make it harder to maintain and evolve. If you have good control over file handles, then non-compound format should work just fine, no?
I'm not yet convinced that the costs of this mid-point justify its benefits. Perhaps the changes are simpler than I imagine. Perhaps it can be done very simply and elegantly with little impact on the code. If so, then my concerns will be reduced.
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