Open Stack

For those of you who don’t subscribe to openstack-dev, see below for the 
nova bug to track better logging of scheduler failures:  
https://bugs.launchpad.net/nova/+bug/1431291





On 3/12/15, 5:23 AM, "Sean Dague" <sean at dague.net> wrote:

>On 03/11/2015 12:53 PM, Sylvain Bauza wrote:
>>> Reporting on Scheduler Fails
>>> ----------------------------
>>>
>>> Apparently, some time recently, we stopped logging scheduler fails
>>> above DEBUG, and that behavior also snuck back into Juno as well
>>> (https://etherpad.openstack.org/p/PHL-ops-nova-feedback L78). This
>>> has made tracking down root cause of failures far more difficult.
>>>
>>> Action: this should hopefully be a quick fix we can get in for Kilo
>>> and backport.
>> It's unfortunate that failed scheduling attempts are providing only an
>> INFO log. A quick fix could be at least to turn the verbosity up to WARN
>> so it would be noticied more easily (including the whole filters stack
>> with their results).
>> That said, I'm pretty against any proposal which would expose those
>> specific details (ie. the number of hosts which are succeeding per
>> filter) in an API endpoint because it would also expose the underlying
>> infrastructure capacity and would ease DoS discoveries. A workaround
>> could be to include in the ERROR message only the name of the filter
>> which has been denied so the operators could very easily match what the
>> user is saying with what they're seeing in the scheduler logs.
>> 
>> Does that work for people ? I can provide changes for both.
>> 
>> -Sylvain
>
>Bug filed for tracking this here -
>https://bugs.launchpad.net/nova/+bug/1431291 if any additional folks
>want to add details.
>
>It's been set as High and a kilo-3 item so it doesn't get lost.
>
>	-Sean
>
>-- 
>Sean Dague
>http://dague.net
>
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