Last modified: 2011-11-25 07:23:33 UTC
We had a ~30 minute outage where pages couldn't be saved on en.wikipedia.org today, because the blob tables on cluster20/cluster21 had reached the default MyISAM 1-million row limit. While the databases are being rebuilt with a raised limit, we restored write capability by switching off $wgDefaultExternalStore for enwiki, so text entries are temporarily being saved straight into the 'text' table. It would probably make a lot of sense if we could do this automatically -- instead of breaking the site, fall back to an acceptable short-term alternative and throw big fat alerts for us to go fix the ES parts.