One question about ceph code

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Hi:
           I'm new to ceph and when I 'm reading ceph code, I find it
hard to understand the semantics of  PG::info::last_update and
PG::info::last_complete (even after reading the comments in code..),
so would you please give a explanation on the two fields and their
semantics and their usage ?
and: When last_complete will be unequal with last_update?
Many thanks.

-- 
Ding Dinghua
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