Hwcp

hwcp was a common shortcut referring to the currently deployed MediaWiki code on application servers. It represents the path /h/w/c/p/ which was a combination of symlinks resolving to /home/wikipedia/common/wmf-deployment/ .

Structure

The canonical place to author /home/wikipedia was on the deployment server, fenari. It contained

• /home/wikipedia/logs/ - On fenari, received logs from other servers via MediaWiki UDP logging. Later migrated to fluorine.
• /home/wikipedia/syslog/
• /home/wikipedia/common/ - The main directory that is synchronised to application servers using scap-1 (then based on dsh and rsync). It contained multiversion, wmf-config and different copies of MediaWiki in php-{version} directories. As canary, test.wikipedia.org requests were routed to an unpooled application server that mounted /h/w/c directly from fenari over NFS.
• /home/wikipedia/common/wmf-deployment/ - symlink to the currently primary php-{version} directory (before 2013).
• /home/wikipedia/common/php/- symlink to the currently primary php-{version} directory (since 2013).