Purged

Wikimedia infrastructure

Data centers

Networking

Global traffic routing

• Global traffic routing
• Caching overview
• DNS
• HTTPS
• HAProxy
• Varnish
• Apache Traffic Server
• Traffic cache hardware
• HTTP timeouts
• Purged
• MediaWiki HTTP cache headers
• Kafka HTTP purging
• URI Path Normalization

MediaWiki

Multimedia

Data Persistence

Observability

Search

Data Engineering

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purged is a daemon running on all cache hosts that reads Kafka purge messages, parses them, and turns them into HTTP PURGE requests to be sent to the local ATS and Varnish daemons.

Detailed information about running purged instances can be found on this grafana dashboard.

The daemon is written in Golang, see the operations-software-purged repo.