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On 7/7/2014 3:28 PM, Jay Pipes wrote:
>
>
> On 07/07/2014 04:17 PM, Mike Bayer wrote:
>>
>> On 7/7/14, 3:57 PM, Matt Riedemann wrote:
>>>
>>>
>>>
>>> Regarding the eventlet + mysql sadness, I remembered this [1] in the
>>> nova.db.api code.
>>>
>>> I'm not sure if that's just nova-specific right now, I'm a bit too
>>> lazy at the moment to check if it's in other projects, but I'm not
>>> seeing it in neutron, for example, and makes me wonder if it could
>>> help with the neutron db lock timeouts we see in the gate [2].  Don't
>>> let the bug status fool you, that thing is still showing up, or a
>>> variant of it is.
>>>
>>> There are at least 6 lock-related neutron bugs hitting the gate [3].
>>>
>>> [1] https://review.openstack.org/59760
>>> [2] https://bugs.launchpad.net/neutron/+bug/1283522
>>> [3] http://status.openstack.org/elastic-recheck/
>>
>>
>> yeah, tpool, correct me if I'm misunderstanding, we take some API code
>> that is 90% fetching from the database, we have it all under eventlet,
>> the purpose of which is, IO can be shoveled out to an arbitrary degree,
>> e.g. 500 concurrent connections type of thing, but then we take all the
>> IO (MySQL access) and put it into a thread pool anyway.
>
> Yep. It makes no sense to do that, IMO.
>
> The solution is to use a non-blocking MySQLdb library which will yield
> appropriately for evented solutions like gevent and eventlet.
>
> Best,
> -jay
>
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>

Yeah, nevermind my comment, since it's not working without an eventlet 
patch, details in the nova bug here [1].  And it sounds like it's still 
not 100% with the patch.

[1] https://bugs.launchpad.net/nova/+bug/1171601

-- 

Thanks,

Matt Riedemann