Reviewed: https://review.opendev.org/658110 Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=2f9e972ba3358fc5bc9bdc06faf47b21d509e20f Submitter: Zuul Branch: master
commit 2f9e972ba3358fc5bc9bdc06faf47b21d509e20f Author: Surya Seetharaman <[email protected]> Date: Thu May 9 16:22:13 2019 +0200 Disable limit if affinity(anti)/same(different)host is requested When max_placement_results is less than the total number of nodes in a deployment it may not be possible to use the affinity, anti-affinity, same host or different host filters as there is no guarantee for placement to return the expected hosts under such situations. This patch disables the max_placement_results parameter when nova queries placement for ``GET /allocation_candidates`` if the request_spec.scheduler_hints containts any of group, same_host or different_host keys. Change-Id: Ia2d5f80b6db59a8f6da03344aeaa6aa599407672 Closes-Bug: #1827628 ** Changed in: nova Status: In Progress => Fix Released -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to OpenStack Compute (nova). https://bugs.launchpad.net/bugs/1827628 Title: Cannot model affinity (and/or anti) with placement "limits" parameter Status in OpenStack Compute (nova): Fix Released Status in OpenStack Compute (nova) queens series: Confirmed Status in OpenStack Compute (nova) rocky series: Confirmed Status in OpenStack Compute (nova) stein series: Confirmed Bug description: It is currently not possible to use affinity/anti-affinity with the placement "limits" parameter since if you want your instance to land on a node where another instance lives you cannot rely on what placement GET/allocation_candidates would return and this could result in a no valid host. Current workaround is to unset the limits parameter. We already have the same-ish problem for disabled computes (https://bugs.launchpad.net/nova/+bug/1805984). We could just do a more generic solution that fits both these cases. The same problem is also applicable to https://docs.openstack.org/nova/latest/admin/configuration/schedulers.html#samehostfilter and https://docs.openstack.org/nova/latest/admin/configuration/schedulers.html#differenthostfilter To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/1827628/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : [email protected] Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
