[resend with plain format, sorry for the duplicated mail]

Hi Loic/Anderas,

I was trying to understand the LRC design in Ceph EC. Per my understanding, it 
seems Ceph was using a slightly different design with the Microsoft LRC: the 
local parities were calculated with the global parities included. Is there any 
special consideration on this change? 
I was asking because in a typical MS LRC design the global and local parities 
could be calculated at the same time actually(I mean inside the Erasure Code 
library). But with this new design, we lost this potential optimization.

Thanks, -Yuan
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