On 09/03/16 05:41, Johannes Grassler wrote:
Hello,
On 03/08/2016 04:57 PM, Zane Bitter wrote:
On 08/03/16 10:40, Johannes Grassler wrote:
On 03/07/2016 04:48 PM, Zane Bitter wrote:
On 04/03/16 04:35, Johannes Grassler wrote:
[Uncaught client exceptions in resource plugins' add_dependencies()
methods]
In the meantime, we need to find and squash every instance of this
problem
wherever we can like you said.
It might also be a good idea to caution against unchecked API client
invocations in
http://docs.openstack.org/developer/heat/developing_guides/pluginguide.html
[...]
It's best if they *do* omit it entirely. The only reason we override
it in
the Neutron resources is that the Neutron API is terrible for
orchestration
purposes[1]. It adds a bunch of invisible, fragile magic that breaks in
subtle ways when e.g. resources are moved into nested stacks.
I never saw the Neutron API that way before (I guess I just got used
to the
unintuitive bits), but seeing it spelled out in your rant makes it very
obvious, yes. I didn't know that was the root cause for overriding
add_dependencies() and that very ignorance of mine...
The default implementation provides everything that we *ought* to
need, so if
we document anything I think it should be that plugin developers
should not
touch add_dependencies() at all.
...suggests mentioning that much is probably a good idea (lest
somebody pick
one of the Neutron plugins as a template to base their own resource
plugin
on).
Definitely not big enough to require a spec IMO.
Yes, I can see that, given how it's not something plugin writers
should do
anyway. Then I'll just write a little paragraph cautioning against
overriding
add_dependcies() and add a Related-Bug: line.
Thanks for that. The paragraph could say that it is preferable to not
override add_dependencies, but if they do then they should *never* make
REST API calls inside it. This is for the reason you've discovered, and
also because it will kill the performance of some stack operations.
From what I can see you've discovered the only 2 places where REST API
calls are made from add_dependencies, I've added comments to the
review[1] to suggest how they can be removed.
[1] https://review.openstack.org/#/c/289371
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