OpenStack Compute (nova)

Pre-filter disabled computes

Registered by Matt Riedemann on 2019-05-08

This blueprint proposes to add a request filter to nova to modify the RequestSpec such that disabled computes will be filtered out of the GET /allocation_candidates response, similar to how the ComputeFilter is used today but filters earlier in placement.

To enable this, nova will need to start reporting disabled status information to placement for a disabled compute service (and all the nodes it manages) in the form of a trait. Plumbing will need to happen in the nova API, compute and scheduler service to link this all together.

Upgrades will need to be taken into account for (1) older computes that don't report the trait and (2) computes that are already disabled. The spec will go into the details.

See https://review.opendev.org/#/c/654596/ for a proof of concept.

Read the full specification

Blueprint information

Status:: Complete

Approver:: None

Priority:: Low

Drafter:: Matt Riedemann

Direction:: Approved

Assignee:: Matt Riedemann

Definition:: Approved

Series goal:: Accepted for train

Implementation:: Implemented

Milestone target:: train-2

Started by: Matt Riedemann on 2019-06-15

Completed by: Matt Riedemann on 2019-07-09

Related branches

Related bugs

Bug #1805984: Placement is not aware of disabled compute nodes

Fix Released

Sprints

Whiteboard

Gerrit topic: https://review.opendev.org/#/q/topic:bp/pre-filter-disabled-computes

Addressed by: https://review.opendev.org/657884
Spec to pre-filter disabled computes with placement

Addressed by: https://review.opendev.org/654596
WIP: Add placement request filter for disabled computes

Addressed by: https://review.opendev.org/668565
Set COMPUTE_STATUS_DISABLED trait from update_provider_tree flow

Addressed by: https://review.opendev.org/667419
Clean up test_virtapi

Addressed by: https://review.opendev.org/668706
Add VirtAPI.update_compute_provider_status

Addressed by: https://review.opendev.org/668707
libvirt: manage COMPUTE_STATUS_DISABLED for hypervisor connection

Addressed by: https://review.opendev.org/668743
Update COMPUTE_STATUS_DISABLED from set_host_enabled compute call

Addressed by: https://review.opendev.org/668752
Add placement request pre-filter compute_status_filter

Addressed by: https://review.opendev.org/668756
Refactor HostAPI.service_update

Addressed by: https://review.opendev.org/668986
Follow up for pre-filter-disabled-computes series

Addressed by: https://review.opendev.org/704865
Repro gen conflict in COMPUTE_STATUS_DISABLED handling

Addressed by: https://review.opendev.org/704866
Reduce gen conflict in COMPUTE_STATUS_DISABLED handling

Gerrit topic: https://review.opendev.org/#/q/topic:bug/1886418

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Work Items

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