Re: snap_trimming + backfilling is inefficient with many purged_snaps

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Hi Sage,

> On 19 Sep 2014, at 17:37, Dan Van Der Ster <daniel.vanderster@xxxxxxx> wrote:
> 
> September 19 2014 5:19 PM, "Sage Weil" <sweil@xxxxxxxxxx> wrote: 
>> On Fri, 19 Sep 2014, Dan van der Ster wrote:
>> 
>>> On Fri, Sep 19, 2014 at 10:41 AM, Dan Van Der Ster
>>> <daniel.vanderster@xxxxxxx> wrote:
>>>>> On 19 Sep 2014, at 08:12, Florian Haas <florian@xxxxxxxxxxx> wrote:
>>>>> 
>>>>> On Fri, Sep 19, 2014 at 12:27 AM, Sage Weil <sweil@xxxxxxxxxx> wrote:
>>>>>> On Fri, 19 Sep 2014, Florian Haas wrote:
>>>>>>> Hi Sage,
>>>>>>> 
>>>>>>> was the off-list reply intentional?
>>>>>> 
>>>>>> Whoops! Nope :)
>>>>>> 
>>>>>>> On Thu, Sep 18, 2014 at 11:47 PM, Sage Weil <sweil@xxxxxxxxxx> wrote:
>>>>>>>>> So, disaster is a pretty good description. Would anyone from the core
>>>>>>>>> team like to suggest another course of action or workaround, or are
>>>>>>>>> Dan and I generally on the right track to make the best out of a
>>>>>>>>> pretty bad situation?
>>>>>>>> 
>>>>>>>> The short term fix would probably be to just prevent backfill for the time
>>>>>>>> being until the bug is fixed.
>>>>>>> 
>>>>>>> As in, osd max backfills = 0?
>>>>>> 
>>>>>> Yeah :)
>>>>>> 
>>>>>> Just managed to reproduce the problem...
>>>>>> 
>>>>>> sage
>>>>> 
>>>>> Saw the wip branch. Color me freakishly impressed on the turnaround. :) Thanks!
>>>> 
>>>> Indeed :) Thanks Sage!
>>>> wip-9487-dumpling fixes the problem on my test cluster. Trying in prod now?
>>> 
>>> Final update, after 4 hours in prod and after draining 8 OSDs -- zero
>>> slow requests :)
>> 
>> That's great news!
>> 
>> But, please be careful. This code hasn't been reiewed yet or been through
>> any testing! I would hold off on further backfills until it's merged.


Any news on those merges? It would be good to get this fixed on the dumpling and firefly branches. We're kind of stuck at the moment :(

Cheers, Dan


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