Enable soft affinity placement in solver scheduler

Registered by Xinyuan Huang on 2015-06-09

Same-host/different-host constraints are too strict. We need to have a way to perform these constraints softly. This blue print should provide AffinityCost and AntiAffinityCost which, instead of being hard constraints, will tend to place instances in same/different hosts but allow exceptions when it is not possible to fulfill these requirements, or when other cost measurements have more significant impacts.

Blueprint information

Status:
Not started
Approver:
Yathiraj Udupi
Priority:
High
Drafter:
Xinyuan Huang
Direction:
Approved
Assignee:
Xinyuan Huang
Definition:
Approved
Series goal:
Accepted for liberty
Implementation:
Unknown
Milestone target:
None

Related branches

Sprints

Whiteboard

Gerrit topic: https://review.openstack.org/#q,topic:bp/soft-affinity-placement,n,z

Addressed by: https://review.openstack.org/189790
    Affiniy/anti-affinity costs for soft affinity placement in solver scheduler

Gerrit topic: https://review.openstack.org/#q,topic:soft-affinity-placement,n,z

Addressed by: https://review.openstack.org/193406
    Affiniy/anti-affinity costs for soft affinity placement in solver scheduler

Addressed by: https://review.openstack.org/193418
    Affiniy/anti-affinity costs for soft affinity placement in solver scheduler

Addressed by: https://review.openstack.org/205827
    Affiniy/anti-affinity costs for soft affinity placement in solver scheduler

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Work Items

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