Heterogeneous deployment/old

Project notes for multiple extension/core version deployment.

Requirements

• Multiple core versions
• Multiple extension versions
• Ability to have at least staging + production

Nice to have

• A/B testing

Issues:

• bits: $wgExtensionAssetsPath and $wgStyleSheetPath
• l10n cache
• separate $IP, but shared configuration
• scap pushing multiple versions
• downgrading
• (figure out if there are any other shared caches)
• APC cache size

Plan:

1. Replace scap with wmsync
2. devise a way to list which sites get which version
3. tweak MWVersion.php for 'live' (w/) stub scripts to check the above list and divert to appropriate $IP
4. ...
5. profit!

(ok....we don't have a full blown plan yet, but we know scap needs work)