Sorry I got confused! Do you mean that both recovery_op_priority and
recovery_priority should be 63 to have a slow recovery?
If so why the client op priority is default 63 and recovery op is 3? This
means that by default recovery op is more prioritize than client op!
In the link you share (Github one) It says that if priority is higher as an
integer it will mean that it prioritizes others!
Can you please clarify this, please? I think this should be documented as
well in Ceph because in general, I think it means that a higher integer
number means higher priority than a lower integer number and so if we set
recovery op priority to 63 it will do recovery too fast and will impact the
overall cluster performance!
Thanks.
On Wed, Dec 2, 2020 at 10:25 PM Anthony D'Atri <anthony.datri(a)gmail.com>
wrote:
FWIW
https://github.com/ceph/ceph/blob/master/doc/dev/osd_internals/backfill_res…
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
<stefan(a)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%20scienc…
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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