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Hello Angus!

IMO, the simple answer on your question is - tests for eventlet and oslo.db
interaction should be in the same place, where eventlet and oslo.db
interact. :)

A little digression - we suppose, that oslo.db should neither know, nor
take care whether target projects use eventlet/gevent/OS threads/multiple
processes/callbacks/etc for handling concurrency - oslo.db just can't (and
should not) make such decisions for users. For the very same reason
SQLAlchemy doesn't do that.

Thanks,
Victor


On Thu, Jul 10, 2014 at 10:55 AM, Angus Lees <guslees at gmail.com> wrote:

> We have an issue with neutron (and presumably elsewhere), where mysqldb
> and eventlet may deadlock, until the mysqldb deadlock timer fires.
> I believe it's responsible for ~all of these failures:
>
> http://logstash.openstack.org/#eyJzZWFyY2giOiJcIkxvY2sgd2FpdCB0aW1lb3V0IGV4Y2VlZGVkOyB0cnkgcmVzdGFydGluZyB0cmFuc2FjdGlvblwiIiwiZmllbGRzIjpbXSwib2Zmc2V0IjowLCJ0aW1lZnJhbWUiOiI2MDQ4MDAiLCJncmFwaG1vZGUiOiJjb3VudCIsInRpbWUiOnsidXNlcl9pbnRlcnZhbCI6MH0sInN0YW1wIjoxNDA0OTcwMzgwMjc0fQ==
>
> Now, the fix is one thing and is underway (the current favourite option is
> just switching to a different mysql client library) - my question here is
> instead about this test:
>
> https://review.openstack.org/#/c/104436/
>
> This test (as written) is against oslo.db and drives eventlet + sqlalchemy
> to confirm that the current sqlalchemy driver does _not_ have the above
> deadlock observed with mysqldb.  I think it (or some version of it) is an
> important test, but the oslo.db guys don't want it in their testsuite since
> they've purged every explicit mention of eventlet.  I'm sympathetic to this
> pov.
>
> I think we should have something like this test *somewhere*, at least as
> long as we're using eventlet frequently.
>
> I'm a bit new to openstack, so I'm lost in a maze of testing options.
>  Could some kind member of the TC point to where this test *should* go?
>
> --
>  - Gus
>
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>
>
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