Placement - Make association_refresh configurable

[Belmiro Moreira]

In Queens the provider-tree refresh happens every 5 min (also in master).
ASSOCIATION_REFRESH = 300

For large deployments this creates unnecessary load in placement.
This option should be configurable.

related with:
https://review.openstack.org/#/c/535517/

[Matt Riedemann (mriedem)]

Add this as a config option on master with a default being the same as the hard-coded value today (300), and include a 'fixes' release note with it since this isn't a feature.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/565526

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/565526
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=41d6b479fe8baf66578044b8773c3b892d64a2c4
Submitter: Zuul
Branch: master

commit 41d6b479fe8baf66578044b8773c3b892d64a2c4
Author: Surya Seetharaman <email address hidden>
Date: Tue May 1 17:51:10 2018 +0200

    Make association_refresh configurable

    The provider-tree refresh in the SchedulerReportClient() instance
    of each compute node happens every five minutes as it is hard coded.
    This patch adds this update interval as a new config option which
    can be set/changed on each compute node.

    Change-Id: I00f92aac44d7b0169f94940ef389796c782b0cc1
    Closes-Bug: #1767309

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/queens
Review: https://review.openstack.org/566288

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/566288
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=3a39cfc471953f95b692c15ce2175bf92035a2da
Submitter: Zuul
Branch: stable/queens

commit 3a39cfc471953f95b692c15ce2175bf92035a2da
Author: Surya Seetharaman <email address hidden>
Date: Tue May 1 17:51:10 2018 +0200

    Make association_refresh configurable

    The provider-tree refresh in the SchedulerReportClient() instance
    of each compute node happens every five minutes as it is hard coded.
    This patch adds this update interval as a new config option which
    can be set/changed on each compute node.

    Conflicts:
        nova/conf/compute.py - because 197539d7a050042463802f6ece98473bbbf9743b
        is missing in Queens.
        nova/scheduler/client/report.py - because f05e6279d092f9d53291ddf69c99a71bfe3989bf
        is missing in Queens.

    Change-Id: I00f92aac44d7b0169f94940ef389796c782b0cc1
    Closes-Bug: #1767309
    (cherry picked from commit 41d6b479fe8baf66578044b8773c3b892d64a2c4)

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/nova 17.0.4 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/nova 18.0.0.0b2 development milestone.