I’m testing gnocchi to work with ceilometer these days and I have some concerns 
about its performance.

I noticed in the code, every time a measure gets updated, gnocchi first reads 
all the previous contents of that measure, updates the measure in memory and 
writes the updated contents as well as original contents back. IMHO, the 
overhead here could be very large. As an improvement, I propose we use some 
form of `seek` that only modifies the updated parts.

So I’d like to hear about your opinions, and if there’s already a solution, 
please point it to me.

Can Zhang

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