Parser cache

Wikimedia infrastructure
Data centres and PoPs Networking Global traffic routing MediaWiki Application servers PHP 7 and php-fpm Dumps Memcached Mcrouter runbook Nutcracker Envoy MediaWiki HTTP caching Redis Parser cache Statsd Kubernetes Media Data Persistence Logs Search [edit]

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.

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).