Add convergence data to the Resource table

Include the URL of your launchpad blueprint:

https://blueprints.launchpad.net/heat/+spec/convergence-resource-table

Problem description

The convergence design requires extra data to be stored with each Resource row in the database, in order to allow different versions of a resource to co-exist within the same stack.

Proposed change

Add the following extra fields to the Resource table:

  • needed_by (a list of Resource keys)
  • requires (a list of Resource keys)
  • replaces (a single Resource key, Null by default)
  • replaced_by (a single Resource key, Null by default)
  • current_template (a single RawTemplate key)

(Note, the first two fields are currently known as requirers and requirements, respectively, in https://github.com/zaneb/heat-convergence-prototype/blob/resumable/converge/resource.py - but those are too confusing. Once we settle on names, we should update the simulator code as well.)

Alternatives

None

Implementation

Assignee(s)

Primary assignee:
skraynev

Milestones

Target Milestone for completion:
Kilo-3

Work Items

  • Database migration

Dependencies

We need to resolve https://bugs.launchpad.net/heat/+bug/1415237 first as that will determine what the type of a Resource key is.

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