Heat Upgrade Tests

https://blueprints.launchpad.net/heat/+spec/upgrade-tests

The new direction of the grenade project is to use devstack-style plugins to support upgrade testing. This spec aims to get upgrade testing infrastructure in Heat’s tree.

Problem description

Currently, there aren’t any tests that check if a patch in-review would break the upgrade of Heat from a previous release.

Some of the issues a deployer may face during or post upgrade are as follows:

  • The deployed database not successfully migrating to the newest schema.
  • Stacks created in an older release not updatable/deletable in new release. A change in the update/delete workflow may render existing stacks useless or be in an IN_PROGRESS state forever.
  • Physical resources disappearing when the control plane is taken down.
  • Configuration options removed prematurely without notice.

Proposed change

Get upgrade testing in-tree by using grenade’s external plugin mechanism. The upgrade tests should follow what grenade calls the Theory of Upgrade - https://github.com/openstack-dev/grenade#theory-of-upgrade

To ease developers writing upgrade tests, we will have (pre/during/post)-upgrade tox envs that will run tests respectively during the (pre/during/post)-upgrade phases in grenade.

As an example, the pre-upgrade phase will create stacks before an upgrade. The during-upgrade phase will check if the resources created by a stack are still alive even when heat’s services are down. The post-upgrade phase could update/delete these stacks to verify that those old stacks are still operable.

Once this infrastructure is in place, we should be able to add support for rolling upgrades of heat-engine with the help of the existing versioned objects mechanism in Heat. This will use Grenade’s partial-upgrade strategy similar to what is being done for Nova.

Alternatives

None

Implementation

Assignee(s)

Primary assignee:
sirushtim

Milestones

Target Milestone for completion:
liberty-2

Work Items

  • In-tree grenade testing.
  • Project config changes to add voting grenade job.
  • Tag smoke tests in heat_integrationtests that must be run during the grenade sanity-check(verify) phase.
  • pre/during/post-env env sections in tox that will respectively invoke the tests before, during and after the upgrade of Heat.
  • Get devstack to use the system level heat binaries instead of the ones in the repository to emulate what a user would face when upgrading heat.
  • Add Upgrade Impact section to heat-specs.
  • Support rolling upgrade of heat-engine.

Dependencies

Grenade external plugin mechanism https://review.openstack.org/#/c/185050

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