Re: snap_trimming + backfilling is inefficient with many purged_snaps

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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.

Roger; I've been watching it very closely and so far it seems to work very well. Looking forward to that merge :)

Cheers, Dan


> 
> Thanks!
> sage
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