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Bug #3774
closedosd: 'ceph osd scrub' and 'ceph pg scrub' are poorly scheduled
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Description
These should get put at the top of the scrub queue in a way that still honors all the scheduling.
The problem is that they are immediately dumped into the work queue, and bypass the scrub reservation across OSDs, making them high-impact on a running cluster.
Currently we scheduled scrub off the last_scrub list, ordered by the last_scrub timestamp. One solution is to queue the PG based on either that, or time 0 if the pg is marked for immediate scrub.
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