MediaWiki's Redis integration currently requires the phpredis extension, which is not available for HHVM. HHVM 2.1.0 includes a pure-PHP Redis extension (see /hphp/system/php/redis, added in https://github.com/facebook/hiphop-php/commit/2811e9da). We should attempt to make MediaWiki compatible with both client libraries.
Version: 1.22.0
Severity: enhancement
URL: https://github.com/facebook/hiphop-php/commit/2811e9da940bb040bd82b2c7d91ff27830e1af32