Parser cache
Jump to navigation
Jump to search
This documentation is a stub. Please expand it.
The parser cache is currently (2011-08-31) backed by MariaDB with hot keys also residing in MediaWiki's main cache (Memcached).
The configuration is in CommonSettings.php (mediawiki-config.git) as part of a MultiWrite wgObjectCaches key.
-
ParserCache in Memcached (tier 1 and tier 2).
-
ParserCache DB (tier 3). MediaWiki uses consistent hashing to distribute entries over the pc1, pc2, and pc3 sections.
Current configuration
- Cache retention period is set to (as of 2021-06-07 - see T282761):
- 21 days for wiki pages
- 10 days for talk pages
- Semi-random tasks from 2021 containing various current knowledge about parser cache: T282761.
- Grafana: Parser Cache
History
Prior to 2011, the parser cache was solely memcached-based.
In 2011, we introduced the MySQL-based parser cache. See Parser cache expansion and Disk-backed object cache for details of the 2011 project.
In 2020, an additional local on-host Memcached tier was enabled for parser cache (T264604).