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Matt,

Yes, Sean already opened a critical bug -
https://bugs.launchpad.net/oslo.reports/+bug/1510740

Please note that this change was added to oslo.reports *after* the liberty
release in support of Mitaka. So i am not sure why we need to add it to liberty
release notes. Also this is a consequence of NOT having version caps which
was a decision a while ago as well.

-- DIms

On Fri, Oct 30, 2015 at 4:47 AM, Matt Riedemann <mriedem at linux.vnet.ibm.com>
wrote:

>
>
> On 10/21/2015 7:43 AM, Kashyap Chamarthy wrote:
>
>> Background
>> ----------
>>
>> Oslo Guru Meditation (error) Reports (GMR)[*] are a useful debugging
>> mechanism that allows one to capture the current state of a Nova
>> process/executable (e.g. `nova-compute`, `nova-api`, etc).
>>
>> The way to generate the error report is to supply the 'User-defined
>> signal', SIGUSR1, when killing a Nova process.  E.g.
>>
>>      $ kill -USR1 `pgrep nova-compute`
>>
>> which results in GMR being printed to your standard error ('stderr')
>> stream, wherever it ends up being redirected to (e.g. to a corresponding
>> Nova process-specific log file, otherwise, on systemd-enabled systems,
>> to its journal).
>>
>>
>> Change in Mitaka (and above)
>> ----------------------------
>>
>>  From the upcoming Mitaka release onwards, the default expected UNIX
>> signal to generate GMR has been changed[1] from USR1 to USR2 (another
>> User-defined singal), because the USR1 is reserved by Apache 'mod_wsgi'
>> for its own purpose.
>>
>> So, to generate GMR, from Mitaka release:
>>
>>      $ kill -USR2 `pgrep nova-compute`
>>
>> A corresponding Nova documentation change[2] has been submitted to
>> reflect this new reality.
>>
>>
>> [1] https://review.openstack.org/#/c/223133/ -- guru_meditation_report:
>>      Use SIGUSR2 instead of SIGUSR1
>> [2] https://review.openstack.org/#/c/227779/ -- doc: gmr: Update
>>      instructions to generate GMR error reports
>>
>>
>> [*] References
>> --------------
>>
>> Related reading:
>>
>> - http://docs.openstack.org/developer/nova/gmr.html
>> - http://docs.openstack.org/developer/oslo.reports/usage.html
>> - https://wiki.openstack.org/wiki/GuruMeditationReport
>> -
>> https://www.berrange.com/posts/2015/02/19/nova-and-its-use-of-olso-incubator-guru-meditation-reports/
>>
>>
> Looks like this broke some tooling in the gate job runs where gmr's are
> created at the end of the service logs when the services exit. Here is a
> mitaka change with grenade on the liberty side with the gmr at the end:
>
>
> http://logs.openstack.org/97/227897/13/check/gate-grenade-dsvm/27723a9/logs/old/screen-n-cpu.txt.gz
>
> And on the new side it's gone:
>
>
> http://logs.openstack.org/97/227897/13/check/gate-grenade-dsvm/27723a9/logs/new/screen-n-cpu.txt.gz
>
> So obviously an upgrade impact, I'm hoping we get this into the liberty
> release notes as something to change when people move up to oslo.reports
> 1.6.0.
>
> We should also get the gate tooling fixed around this, I'm not sure where
> that was configured/triggered though, sdague probably knows.
>
> --
>
> Thanks,
>
> Matt Riedemann
>
>
>
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-- 
Davanum Srinivas :: https://twitter.com/dims
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