[Bug 54808] Add numberOfVersionsToKeep when undeployOldVersions is set to true

[bu...@apache.org]

https://issues.apache.org/bugzilla/show_bug.cgi?id=54808

--- Comment #2 from Mark Thomas <ma...@apache.org> ---
I'm not convinced of the usefulness of this feature.

The stated purpose is fall-back. Consider an application on version 1 and
version 2 is deployed. If a system admin wants the ability to fall-back to
version 1 if problems are noticed with version 2:
- With this option implemented, falling back would require deleting version 2
which will break the session for every user currently using version 2. That may
not be the desired behaviour.
- Once version 2 is considered stable version 1 would need to be manually
removed. This makes the undeployOldVersions feature unnecessary which in turn
makes this feature unnecessary.

Users wanting the ability to fall-back to version 1 after version 2 has been
deployed would be better following a different process:
- leave undeployOldVersions="true"
- deploy version 2
- if fall back is required
  - deploy a copy of version 1 labelled as version 3
  - delete version 2 if it is necessary to force users of version 2

I'd be happy to commit this new feature if there is a use case that cannot
easily be met by the current features but fallback does not appear to be it.

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