https://bugzilla.wikimedia.org/show_bug.cgi?id=59941
Web browser: ---
Bug ID: 59941
Summary: Flow: in default config posts don't appear
Product: MediaWiki extensions
Version: master
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: Flow
Assignee: wikibugs-l@lists.wikimedia.org
Reporter: sp...@wikimedia.org
CC: ebernhard...@wikimedia.org, oke...@wikimedia.org,
pandiculat...@gmail.com,
shahyar+wmfbugzi...@gmail.com, sp...@wikimedia.org,
wctai...@gmail.com
Classification: Unclassified
Mobile Platform: ---
If you add Flow to MediaWiki-Vagrant, and do no other configuration, you can
add topics and posts, but when you later redisplay a topic, e.g. click its
permalink icon, you don't see any of its posts! Shahyar, wctaiwan and I all
discovered this.
The post does show up in the topic history and the post text is in the
flow_revision table, so this is probably a caching issue. Setting
$wgFlowUseMemcache = false fixes it (I think it makes Flow use HashBagOStuff).
So maybe false should be Flow's default, and overridden by a WMF wmf-config
setting.
Another wrinkle is MediaWiki-Vagrant does enable a cache, but it is
$wgMainCacheType = 'redis'. So $wgFlowUseMemcache = true should work, since it
makes Flow use $wgMemc that ends up being RedisBagOStuff. I'm not sure why
it's failing.
Maybe Flow should be flexible and have a $wgFlowCacheType that defaults to
CACHE_ANYTHING or CACHE_MEMCACHE, the way system caches like $wgParserCache do.
Or it could use $wgMemc all the time, since that misnamed function always does
something: it'll use MemcachedPhpBagOStuff or RedisBagOStuff if they're
configured, otherwise it falls back to EmptyBagOStuff (dummy cache).
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