Yes it does. We actually tried to use a pool at diablo release and it was very broken. There was discussion about moving over to a pure-python mysql library, but it hasn't been tried yet.
Vish On Mar 1, 2012, at 11:45 AM, Yun Mao wrote: > There are plenty eventlet discussion recently but I'll stick my > question to this thread, although it's pretty much a separate > question. :) > > How is MySQL access handled in eventlet? Presumably it's external C > library so it's not going to be monkey patched. Does that make every > db access call a blocking call? Thanks, > > Yun > > On Wed, Feb 29, 2012 at 9:18 PM, Johannes Erdfelt <johan...@erdfelt.com> > wrote: >> On Wed, Feb 29, 2012, Yun Mao <yun...@gmail.com> wrote: >>> Thanks for the explanation. Let me see if I understand this. >>> >>> 1. Eventlet will never have this problem if there is only 1 OS thread >>> -- let's call it main thread. >> >> In fact, that's exactly what Python calls it :) >> >>> 2. In Nova, there is only 1 OS thread unless you use xenapi and/or the >>> virt/firewall driver. >>> 3. The python logging module uses locks. Because of the monkey patch, >>> those locks are actually eventlet or "green" locks and may trigger a >>> green thread context switch. >>> >>> Based on 1-3, does it make sense to say that in the other OS threads >>> (i.e. not main thread), if logging (plus other pure python library >>> code involving locking) is never used, and we do not run a eventlet >>> hub at all, we should never see this problem? >> >> That should be correct. I'd have to double check all of the monkey >> patching that eventlet does to make sure there aren't other cases where >> you may inadvertently use eventlet primitives across real threads. >> >> JE >> >> >> _______________________________________________ >> Mailing list: https://launchpad.net/~openstack >> Post to : openstack@lists.launchpad.net >> Unsubscribe : https://launchpad.net/~openstack >> More help : https://help.launchpad.net/ListHelp > > _______________________________________________ > Mailing list: https://launchpad.net/~openstack > Post to : openstack@lists.launchpad.net > Unsubscribe : https://launchpad.net/~openstack > More help : https://help.launchpad.net/ListHelp _______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp