Switch to taskflow for things like create, update in services

Registered by Endre Karlson

Switching to taskflow could allow for better handling of errors and tasks in general.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
Assignee:
Endre Karlson
Definition:
Approved
Series goal:
None
Implementation:
Unknown
Milestone target:
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Sprints

Whiteboard

See http://paste.openstack.org/show/45220/ for notifications. Also errors for a given task should be stored in persistance.

flow.revert_strategy = cls
flow.retries = ....

Gerrit topic: https://review.openstack.org/#q,topic:taskflow,n,z

Addressed by: https://review.openstack.org/43009
    Switch to taskflow for collector

Gerrit topic: https://review.openstack.org/#q,topic:bp/taskflow,n,z

Addressed by: https://review.openstack.org/43915
    Add some errorhandling to tasks and states

(?)

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