HTML: https://anticdent.org/placement-update-19-23.html
19-23. I'll be travelling the end of next week so there will be no 19-24.
# Most Important
We keep having interesting and helpful, but not yet fully conclusive, discussions related to the [spec for nested magic](https://review.opendev.org/662191). The discussion on the spec links back to a few different IRC discussions. Part of the reason this drags on so much is that we're trying to find a model that is internally consistent in placement and generally applicable while satisfying the NUMA requirements from Nova, while not requiring either Placement or Nova to bend over backwards to get things right, and while not imposing additional complexity on simple requests.
(And probably a few other whiles...)
If you have thoughts on these sorts of things, join that review. In the meantime there are plenty of other things to review (below).
# What's Changed
* A blocker migration for incomplete consumers has been added, and the inline migrations that would guard against the incompleteness have been removed.
* CORS configuration and use in Placement has been modernized and corrected. You can now, if you want, talk to Placement from JavaScript in your browser. (This was a bug I found while working on a [visualisation toy](https://github.com/cdent/placeview) with a friend.)
* Result sets for certain nested provider requests could return different results in Python versions 2 and 3. This has [been fixed](https://review.opendev.org/663137).
* That ^ work was the result of working on implementing [mappings in allocations](https://docs.openstack.org/placement/latest/specs/train/approved/placement-r...) which has [merged today as microversion 1.34](https://docs.openstack.org/placement/latest/placement-api-microversion-histo...)
# Specs/Features
* https://review.opendev.org/654799 Support Consumer Types. This has some open questions that need to be addressed, but we're still go on the general idea.
* https://review.opendev.org/662191 Spec for nested magic 1. The easier parts of nested magic: same_subtree, resourceless request groups, verbose suffixes (already merged as 1.33). See "Most Important" above.
Some non-placement specs are listed in the Other section below.
# Stories/Bugs
(Numbers in () are the change since the last pupdate.)
There are 20 (0) stories in [the placement group](https://storyboard.openstack.org/#!/project_group/placement). 0 (0) are [untagged](https://storyboard.openstack.org/#!/worklist/580). 3 (0) are [bugs](https://storyboard.openstack.org/#!/worklist/574). 6 (2) are [cleanups](https://storyboard.openstack.org/#!/worklist/575). 11 (0) are [rfes](https://storyboard.openstack.org/#!/worklist/594). 2 (0) are [docs](https://storyboard.openstack.org/#!/worklist/637).
If you're interested in helping out with placement, those stories are good places to look.
* Placement related nova [bugs not yet in progress](https://goo.gl/TgiPXb) on launchpad: 16 (1).
* Placement related nova [in progress bugs](https://goo.gl/vzGGDQ) on launchpad: 6 (-1).
[1832814: Placement API appears to have issues when compute host replaced](https://bugs.launchpad.net/nova/+bug/1832814) is an interesting bug. In a switch from RDO to OSA, resource providers are being duplicated because of a change in node name.
# osc-placement
osc-placement is currently behind by 11 microversions.
There are no changes that have had attention in less than 4 weeks. There are 4 other changes.
# Main Themes
## Nested Magic
The overview of the features encapsulated by the term "nested magic" are in a [story](https://storyboard.openstack.org/#!/story/2005575) and [spec](https://review.opendev.org/662191).
There is some in progress code, mostly WIPs to expose issues and think about how things ought to work:
* https://review.opendev.org/663009 PoC: resourceless request, including some code from https://review.opendev.org/657510 WIP: Allow RequestGroups without resources
## Consumer Types
Adding a type to consumers will allow them to be grouped for various purposes, including quota accounting. A [spec](https://review.opendev.org/654799) has started. There are some questions about request and response details that need to be resolved, but the overall concept is sound.
## Cleanup
We continue to do cleanup work to lay in reasonable foundations for the nested work above. As a nice bonus, we keep eking out additional performance gains too. There are two new stories about some minor performance degradations:
* https://storyboard.openstack.org/#!/story/2005888 GET /allocations/{non existent consumer} slower than expected
* https://storyboard.openstack.org/#!/story/2005889 Allocation mappings have introduced a slight performance reduction
Gibi discovered that osprofiler wasn't working with placement and then fixed it:
* https://review.opendev.org/663945 Add support for osprofiler in wsgi
Thanks to Ed Leafe for his report on the [state of graph database work](http://lists.openstack.org/pipermail/openstack-discuss/2019-June/007037.html).
# Other Placement
Miscellaneous changes can be found in [the usual place](https://review.opendev.org/#/q/project:openstack/placement+status:open).
There are three [os-traits changes](https://review.opendev.org/#/q/project:openstack/os-traits+status:open) being discussed. And one [os-resource-classes change](https://review.opendev.org/#/q/project:openstack/os-resource-classes+status:...).
# Other Service Users
New discoveries are added to the end. Merged stuff is removed. Anything that has had no activity in 4 weeks has been removed.
* https://review.openstack.org/601596 Nova: spec: support virtual persistent memory
* https://review.openstack.org/#/q/topic:bug/1819923 Nova: nova-manage: heal port allocations
* https://review.openstack.org/650188 nova-spec: Allow compute nodes to use DISK_GB from shared storage RP
* https://review.opendev.org/659233 Cyborg: Placement report
* https://review.opendev.org/657801 rpm-packaging: placement service
* https://review.opendev.org/657016 Delete resource providers for all nodes when deleting compute service
* https://review.opendev.org/654066 nova test and fix for: Drop source node allocations if finish_resize fails
* https://review.opendev.org/656885 nova: WIP: Hey let's support routed networks y'all!
* https://review.opendev.org/662371 starlingx: Add placement chart patch to openstack-helm
* https://review.opendev.org/662229 helm: WIP: add placement chart
* https://review.opendev.org/662164 kolla-ansible: Add a explanatory note for "placement_api_port"
* https://review.opendev.org/656023 Nova: Use OpenStack SDK for placement
* https://review.opendev.org/612497 Nova: Spec: Provider config YAML file
* https://review.opendev.org/623558 Nova: single pass instance info fetch in host manager
* https://review.opendev.org/663478 docs: Add Placement service to Minimal deployment for Stein
* https://review.opendev.org/663270 devstack: Add setting of placement microversion on tempest conf
* https://review.opendev.org/634551 libvirt: report pmem namespaces resources by provider tree
* https://review.opendev.org/660852 Nova: Remove PlacementAPIConnectFailure handling from AggregateAPI
* https://review.opendev.org/661237 Nova: Validate requested host/node during servers create
* https://review.opendev.org/#/q/topic:bp/support-move-ops-with-qos-ports Nova: support move ops with qos ports
* https://review.opendev.org/664631 Kolla-ansible: Fix placement log perms in config.json
* https://review.opendev.org/665168 TripleO: Enable Request Filter for Image Types
* https://review.opendev.org/663979 Neutron: Force segments to use placement 1.1
* https://review.opendev.org/664689 Nova: get_ksa_adapter: nix by-service-type confgrp hack
* https://review.opendev.org/664862 OSA: Add nova placement to placement migration
# End
If you, like me, use this collection of information to drive what to do early in the next week, you might like [placement-reviewme](https://github.com/cdent/placement-reviewme) which brute force loads all the links from the HTML version of this in tabs in your browser.