[openstack-dev] [Nova] Database changes coming in Grizzly
Daniel P. Berrange
berrange at redhat.com
Mon Jan 28 10:14:07 UTC 2013
On Fri, Jan 25, 2013 at 01:44:13PM -0800, Vishvananda Ishaya wrote:
> On Jan 25, 2013, at 8:38 AM, Daniel P. Berrange <berrange at redhat.com> wrote:
> > On Fri, Jan 25, 2013 at 08:24:08AM -0800, Devananda van der Veen wrote:
> >> * Non-blocking-db -
> >> https://blueprints.launchpad.net/nova/+spec/non-blocking-db
> >> - Use eventlet's db-pool so that MySQL queries don't block the whole
> >> python process.
> >> - Progress: done, but has a known bug (
> >> https://bugs.launchpad.net/nova/+bug/1097992 )
> >> - Impact: user-facing. This feature is disabled by default; deployer must
> >> choose to enable it.
> > IMHO this kind of config parameter is really dubious. If the feature
> > works then we should enable it so that people testing Grizzly actually
> > exercise the code. If it doesn't work there's no point having a config
> > parameter to enable it, because the toggling it just gives them a broken
> > system. Assuming the known bug gets fixed, IMHO the config parameter
> > should be removed so that we get real testing of it by everyone using
> > and developing Grizzly, not just the 1 or 2 people who might have
> > manually enabled it.
> > Daniel
> The issue is that last time we merged the code (diablo release), we discovered
> an issue after the fact and had to patch it back out. Unfortunately the bug
> was only showing up in multinode installs under load, so we added it back
> in protected by a config option so we could do some testing with it in larger
> installs. I don't want to turn it on my default until we are sure that the
> previous issues are fixed.
How are we going to be sure it is working reliably though, if it is off
by default & thus rarely gets exercised ? Can we at least enable it by
default in DevStack, so that openstack developers are testing the code
by default, even if production builds won't have it enabled.
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