Add scheduler hints

Registered by Masaki Matsushita on 2015-09-29

This blueprint adds a new attribute "scheduler_hints" to
create_instance(). This feature enables users to make some
advices (like affinity/anti-affinity) for nova scheduler.
For example, users can pass hints to schedule master and
slave nodes into different compute node.

# create server-group with "anti-affinity" policy
% nova server-group-create foo anti-affinity
+--------------------------------------+------+--------------------+---------+----------+
| Id | Name | Policies | Members | Metadata |
+--------------------------------------+------+--------------------+---------+----------+
| ef1e5347-acbf-4123-8445-858e61d8f48f | foo | [u'anti-affinity'] | [] | {} |
+--------------------------------------+------+--------------------+---------+----------+

# call Trove API with scheduler_hints to specify server-group
body = {
    "instance": {
        "volume": {"size": 5},
        "flavorRef": "2",
        "name": "foo",
        "datastore": {"version": "5.6", "type": "mysql"},
        "replica_count": 1,
        "scheduler_hints": {"group": "ef1e5347-acbf-4123-8445-858e61d8f48f"}
    }
}
print t.instances._create("/instances", body, "instance")

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Masaki Matsushita
Direction:
Needs approval
Assignee:
Masaki Matsushita
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

Related branches

Sprints

Whiteboard

Gerrit topic: https://review.openstack.org/#q,topic:bp/add-scheduler-hints,n,z

Addressed by: https://review.openstack.org/228784
    Add scheduler_hints attributes to create_instance

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