Change Details

### Motivation * Reduce the number of things you have to "get right" as a MediaWiki sysadmin. * Reduce the number of things you have to know about and/or debug as a MediaWiki developer. * Reduce the number of things Perf Team have to support, as maintainer of the BagOStuff library. * Improve performance and reliability by re-using the same underlying Memcached connection when possible. ### Work * [ ] Remove `wgMainWANCache` and `$wgWANObjectCaches`, in favour of `$wgMainCacheType`. * [ ] Make the "local cluster cache" object owned by service wiring instead of ObjectCache.php. * [ ] Re-use this in the MainWANObjectCache service. * [ ] Update relevant sysadmin docs in MainConfigSchema.php and on mediawiki.org.

### Motivation * Reduce the number of things you have to "get right" as a MediaWiki sysadmin. * Reduce the number of things you have to know about and/or debug as a MediaWiki developer. * Reduce the number of things Perf Team have to support, as maintainer of the BagOStuff library. * Improve performance and reliability by re-using the same underlying Memcached connection when possible. ### Background The `$wgMainWANCache` and `$wgWANObjectCaches` configurability was introduced as part of the original 2015 Mult-DC plan. The expectation was that in order to faccilitate broadcasting of purges/tombstones, there'd be a "main" one and another one to send purges to. The actual implementation ended up quite different and so this infrastructure was never used. ### Work * [ ] Remove `$wgMainWANCache` and `$wgWANObjectCaches`, in favour of `$wgMainCacheType`. * [ ] Make the "local cluster cache" object owned by service wiring instead of ObjectCache.php. * [ ] Re-use this in the MainWANObjectCache service. * [ ] Update relevant sysadmin docs in MainConfigSchema.php and on mediawiki.org.

### Motivation * Reduce the number of things you have to "get right" as a MediaWiki sysadmin. * Reduce the number of things you have to know about and/or debug as a MediaWiki developer. * Reduce the number of things Perf Team have to support, as maintainer of the BagOStuff library. * Improve performance and reliability by re-using the same underlying Memcached connection when possible. ### Background The `$wgMainWANCache` and `$wgWANObjectCaches` configurability was introduced as part of the original 2015 Mult-DC plan. The expectation was that in order to faccilitate broadcasting of purges/tombstones, there'd be a "main" one and another one to send purges to. The actual implementation ended up quite different and so this infrastructure was never used. ### Work * [ ] Remove `$wgMainWANCache` and `$wgWANObjectCaches`, in favour of `$wgMainCacheType`. * [ ] Make the "local cluster cache" object owned by service wiring instead of ObjectCache.php. * [ ] Re-use this in the MainWANObjectCache service. * [ ] Update relevant sysadmin docs in MainConfigSchema.php and on mediawiki.org.