FWIW 
https://github.com/ceph/ceph/blob/master/doc/dev/osd_internals/backfill_reservation.rst
 has some discussion of op priorities, though client ops aren’t mentioned 
explicitly.  If you like, enter a documentation tracker and tag me and I’ll 
look into adding that.

> On Dec 2, 2020, at 9:56 AM, Stefan Kooman <ste...@bit.nl> wrote:
> 
> On 12/2/20 5:36 PM, Seena Fallah wrote:
>> If it uses PriorityQueue 
>> <https://en.wikipedia.org/wiki/Priority_queue#:~:text=In%20computer%20science%2C%20a%20priority,an%20element%20with%20low%20priority.>
>>  Data Structure an element with high priority should be dequeued before an 
>> element with low priority.
> 
> - osd client op priority
> The priority set for client operations. It is relative to osd recovery op 
> priority.
> 
> The op priority for client io is (default) 63. So with that regard a lower 
> value should be lower priority. Same as the PriorityQueue you linked.
> 
> A simple example would be a great way to take out any confusion. I'll try to 
> attend a "Docubetter" meeting to discuss this.
> 
> Gr. Stefan
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