Last modified: 2014-04-06 09:54:09 UTC
Replication lag is now at about 4350 s for s1 and 83440 s for s4 (cf. also http://permalink.gmane.org/gmane.org.wikimedia.labs/2304).
See http://tools.wmflabs.org/betacommand-dev/cgi-bin/replag
This has recovered. Some users were running very slow DELETE queries of the form DELETE ... WHERE ... (SELECT ... ) with no limits or batches. This sort of bad practice has been brought up on Labs-l previously, but it seems it will need policing.