HTML: https://anticdent.org/placement-update-19-30.html
Pupdate 19-30 is brought to you by the letter P for Performance.
# Most Important
The main things on the Placement radar are implementing Consumer Types and cleanups, performance analysis, and documentation related to nested resource providers.
# What's Changed
* [os-traits 0.16.0 was released](https://review.opendev.org/673294) was released, with a corresponding [canary update](https://review.opendev.org/673964).
* The [ProviderIds namedtuple was removed](https://review.opendev.org/673788). This is the first in a series of performance optimizations discovered as part of the analysis described below in the Cleanup section.
# Stories/Bugs
(Numbers in () are the change since the last pupdate.)
There are 23 (2) stories in [the placement group](https://storyboard.openstack.org/#!/project_group/placement). 0 (0) are [untagged](https://storyboard.openstack.org/#!/worklist/580). 3 (1) are [bugs](https://storyboard.openstack.org/#!/worklist/574). 5 (0) are [cleanups](https://storyboard.openstack.org/#!/worklist/575). 11 (1) are [rfes](https://storyboard.openstack.org/#!/worklist/594). 4 (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: 17 (0).
* Placement related nova [in progress bugs](https://goo.gl/vzGGDQ) on launchpad: 4 (0).
# osc-placement
osc-placement is currently behind by 12 microversions.
* https://review.opendev.org/666542 Add support for multiple member_of. There's been some useful discussion about how to achieve this, and a consensus has emerged on how to get the best results.
* https://review.opendev.org/640898 Adds a new '--amend' option which can update resource provider inventory without requiring the user to pass a full replacement for inventory
# Main Themes
## Consumer Types
Adding a type to consumers will allow them to be grouped for various purposes, including quota accounting.
* https://review.opendev.org/#/q/topic:bp/support-consumer-types A WIP, as microversion 1.37, has started.
## Cleanup
Cleanup is an overarching theme related to improving documentation, performance and the maintainability of the code. The changes we are making this cycle are fairly complex to use and are fairly complex to write, so it is good that we're going to have plenty of time to clean and clarify all these things.
I started some performance analysis this week. Initially I started working with [placement master in a container](https://anticdent.org/profiling-placement-in-docker.html) but as I started making changes I moved back to [container-less](https://anticdent.org/profiling-wsgi-apps.html). What I discovered was that there is quite a bit of redundancy in the code in the `objects` package that I was able to remove. For example we were creating at least twice as many ProviderSummary objects than required in a situation with multiple request groups. It's likely there would have been more duplicates with more request groups. That's improved in [this change](https://review.opendev.org/674254), which is at the end of a stack of several other like-minded improvements.
The improvements in that stack will not be obvious until the [more complex nested topology](https://review.opendev.org/#/c/673513/) is generally available. My analysis was based on that topology.
Not to put too fine a point on it, but this kind of incremental analysis and improvement is something I think we (the we that is the community of OpenStack) should be doing far more often. It is _incredibly_ revealing about how the system works and opportunities for making the code both work better and be easier to maintain.
One outcome of this work will be something like a _Deployment Considerations_ document to help people choose how to tweak their placement deployment to match their needs. The simple answer is use more web servers and more database servers, but that's often very wasteful.
# Other Placement
Miscellaneous changes can be found in [the usual place](https://review.opendev.org/#/q/project:openstack/placement+status:open).
There is one [os-traits changes](https://review.opendev.org/#/q/project:openstack/os-traits+status:open) being discussed. And two [os-resource-classes changes](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/#/q/topic:bug/1819923 Nova: nova-manage: heal port allocations
* https://review.opendev.org/659233 Cyborg: Placement report
* https://review.opendev.org/662229 helm: add placement chart
* 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/670112 Nova: WIP: Add a placement audit command
* https://review.opendev.org/586960 zun: [WIP] Use placement for unified resource management
* https://review.opendev.org/671478 Kayobe: Build placement images by default
* https://review.opendev.org/671312 blazar: Fix placement operations in multi-region deployments
* https://review.opendev.org/671793 Nova: libvirt: Start reporting PCPU inventory to placement
* https://review.opendev.org/#/q/topic:bp/support-move-ops-with-qos-ports Nova: support move ops with qos ports
* https://review.opendev.org/664689 Nova: get_ksa_adapter: nix by-service-type confgrp hack
* https://review.opendev.org/666202 Blazar: Create placement client for each request
* https://review.opendev.org/667952 nova: Support filtering of hosts by forbidden aggregates
* https://review.opendev.org/669079 blazar: Send global_request_id for tracing calls
* https://review.opendev.org/668252 Nova: Update HostState.*_allocation_ratio earlier
* https://review.opendev.org/670696 tempest: Add placement API methods for testing routed provider nets
* https://review.opendev.org/672678 openstack-helm: Build placement in OSH-images
* https://review.opendev.org/674129 Correct global_request_id sent to Placement
# End
I started working with around approximately 20,000 providers this week. Only 980,000 to go.