https://bugzilla.wikimedia.org/show_bug.cgi?id=42094
Web browser: ---
Bug #: 42094
Summary: Minifier cache + user-specific module timestamps =
rapid objectcache growth
Product: MediaWiki
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: ResourceLoader
AssignedTo: wikibugs-l@lists.wikimedia.org
ReportedBy: roan.katt...@gmail.com
CC: krinklem...@gmail.com, roan.katt...@gmail.com,
tpars...@wikimedia.org
Classification: Unclassified
Mobile Platform: ---
Some of the timestamps in the startup module are user-specific, which means a
lot of different versions of the startup module are served. These all get run
through the minifier, which puts them in the minifier cache. This caches the
result by MD5 hash, and the cache entry never expires. This is wasteful but OK
in a system like memcached that does LRU eviction, but it's much less OK in a
system without evictions, such as the objectcache table.
According to the report at
https://www.mediawiki.org/wiki/Talk:ResourceLoader#Cache_consumption_20440 this
leads to something like 30 MB/day of cache growth, which is bad. We should
redesign the minifier cache to behave more gracefully.
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