Questions about the CRUSH details

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Hello, I'm new to ceph and sorry in advance for the naive questions.

As far as I know, CRUSH utilizes the cluster map consisting of the PG
map and others.
I don't understand why CRUSH computation is required on client-side,
even though PG-to-OSDs mapping can be acquired from the PG map.

how does the client get a valid(old) OSD set when the PG is being
remapped to a new ODS set which CRUSH returns?

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