[openstack-dev] [oslo.db] PyMySQL review

Doug Hellmann doug at doughellmann.com
Thu Jan 29 00:03:42 UTC 2015

On Wed, Jan 28, 2015, at 06:50 PM, Johannes Erdfelt wrote:
> On Wed, Jan 28, 2015, Clint Byrum <clint at fewbar.com> wrote:
> > As is often the case with threading, a reason to avoid using it is
> > that libraries often aren't able or willing to assert thread safety.
> > 
> > That said, one way to fix that, is to fix those libraries that we do
> > want to use, to be thread safe. :)
> I floated this idea across some coworkers recently and they brought up a
> similar concern, which is concurrency in general, both within our code
> and dependencies.
> I can't find many places in Nova (at least) that are concurrent in the
> sense that one object will be used by multiple threads. nova-scheduler
> is likely one place. nova-compute would likely be easy to fix if there
> are any problems.
> That said, I think the only way to know for sure is to try it out and
> see. I'm going to hack up a proof of concept and see how difficult this
> will be.

I hope someone who was around at the time will chime in with more detail
about why green threads were deemed better than regular threads, and I
look forward to seeing your analysis of a change. There is already a
thread-based executor in oslo.messaging, which *should* be usable in the
applications when you remove eventlet.


> JE
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