Open Stack

Interesting analysis.

I wonder if all things using 'LoopingCall' should really not be in the
same process.

Maybe that would fix the problem instead of trying to adjust the interval
'dynamically' by at least let the operating system deal with the
scheduling part (what I assume its good at) and not eventlet.

On 11/19/12 7:11 PM, "Jiang, Yunhong" <yunhong.jiang at intel.com> wrote:

>Some similar discussion on periodic task happens on ceilometer side also
>, see 
>http://lists.openstack.org/pipermail/openstack-dev/2012-November/002937.ht
>ml 
>
>--jyh
>
>> -----Original Message-----
>> From: Michael Still [mailto:michael.still at canonical.com]
>> Sent: Tuesday, November 20, 2012 10:57 AM
>> To: OpenStack Development Mailing List
>> Subject: [openstack-dev] A new nova service? nova-periodic?
>> 
>> I don't much mind what we call it by the way.
>> 
>> Josh raises a valid point in bug/1080921 -- nova-compute periodic tasks
>> block incoming API requests from being handled, which is probably
>> something that you'd never want to see happen in a production
>>deployment.
>> 
>> There's been some back and forth about this in terms of libvirt image
>> cache management, but it seems that many of the periodic tasks fall into
>> a category of "I want this to run, but I don't want to block servicing
>> API requests for it".
>> 
>> What do people think about adding another nova service which runs beside
>> nova-compute and runs periodic tasks which don't need any sort of shared
>> global state with nova-compute? We could do it with a flag so that the
>> default remains to use nova-compute for these periodic tasks, but if you
>> "opt in" they're done with a nova-periodic instead.
>> 
>> Thoughts?
>> 
>> Michael
>> 
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>
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