User blog comment:TOR/MediaWiki Upgrade/@comment-3508190-20120613063437/@comment-23865-20120613165726

This seems like a problem with our slave databases or cache servers. Either way, it's not connected to the upgrade.

Such issues might be momentary, but if you're seeing this consistently over a longer period of time, please contact Community Support and be sure to provide relevant URLs as well as details on your usage of action=raw, and we'll look into it.