No notifications on Neutron tag operations

[Steve McLellan]

When a tag's added to (or removed from) a resource, no notification is generated indicating that the network (or port or whatever) has changed, although tags *are* included in notification and API data for those resources. It'd be more consistent if attaching a tag to a network generated a notification in the same way as if it were renamed.

My use case is that Searchlight would really like to index tags attached to networks, routers, etc since it's a very powerful feature but we can't provide up to date information unless a notification's sent.

Tested on neutron mitaka rc1.

[Hirofumi Ichihara (ichihara-hirofumi)]

I'm not sure how notifications are passed to external system about updating network DB although I understand notification mechanism between servers and agents. Does neutron server notify when network is renamed?

[Steve McLellan (sjmc7)]

Yeah, there are events for update operations like renames - network.update.end, subnet.update.end etc. I know very little about neutron's codebase, unfortunately, though i may take a look once the mitaka release is out of the way.

[Travis Tripp (travis-tripp)]

On Searchlight side, being able to search by tag is very important (so setting high importance), but of course it is blocked and there is not a blocked status field.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/298133

[Hirofumi Ichihara (ichihara-hirofumi)]

@Steve McLellan: Thank you. I got it. I pushed PoC. Can you review it(especially, I 'd like a suggestion about event_type)?

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/298133
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=0daed9ebcab7d46d066fd9d8af576d9aca0a7205
Submitter: Jenkins
Branch: master

commit 0daed9ebcab7d46d066fd9d8af576d9aca0a7205
Author: Hirofumi Ichihara <email address hidden>
Date: Tue Nov 29 14:26:24 2016 +0900

    Add notify for tag operations

    When a tag's added to (or removed from) a resource, no notification is
    generated indicating that the network (or port or whatever) has changed.
    This patch adds notify for tag operations.

    Change-Id: I4373b2220f87751a4d89462bef37d04bf9a71fe7
    Closes-Bug: #1560226

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/neutron 10.0.0.0b3 development milestone.