Re: Crash and strange things on MDS

[Marc-Antoine Perennou <keruspe-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Le 15 mars 2013 à 21:32, Greg Farnum <greg@inktank.com> a écrit :

> On Friday, March 8, 2013 at 3:29 PM, Kevin Decherf wrote:
>> On Fri, Mar 01, 2013 at 11:12:17AM -0800, Gregory Farnum wrote:
>>> On Tue, Feb 26, 2013 at 4:49 PM, Kevin Decherf <kevin@kdecherf.com (mailto:kevin@kdecherf.com)> wrote:
>>>> You will find the archive here: <snip>
>>>> The data is not anonymized. Interesting folders/files here are
>>>> /user_309bbd38-3cff-468d-a465-dc17c260de0c/*
>>>
>>>
>>>
>>> Sorry for the delay, but I have retrieved this archive locally at
>>> least so if you want to remove it from your webserver you can do so.
>>> :) Also, I notice when I untar it that the file name includes
>>> "filtered" — what filters did you run it through?
>>
>>
>>
>> Hi Gregory,
>>
>> Do you have any news about it?
>
> I wrote a couple tools to do log analysis and created a number of bugs to make the MDS more amenable to analysis as a result of this.
> Having spot-checked some of your longer-running requests, they're all getattrs or setattrs contending on files in what look to be shared cache and php libraries. These cover a range from ~40 milliseconds to ~150 milliseconds. I'd look into what your split applications are sharing across those spaces.
>
> On the up side for Ceph, >80% of your requests take "0" milliseconds and ~95% of them take less than 2 milliseconds. Hurray, it's not ridiculously slow most of the time. :)
> -Greg
>
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Thank you a lot for these explanations, looking forward for these fixes!
Do you have some public bug reports regarding this to link us?

Good luck, thank you for your great job and have a nice weekend

Marc-Antoine Perennou
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