I'm not really sure what's going on, but some renameuser queries are timing out on mediawikiwiki, causing the rename jobs to fail (they typically succeed the next time the job queue retries them). I haven't seen this on any other wiki yet. Overall they're also running slower compared to other wikis.
Examples:
```
2015-04-18 19:46:58 mw1006 mediawikiwiki: [e55535e1] /rpc/RunJobs.php?wiki=media
wikiwiki&type=LocalRenameUserJob&maxtime=60&maxmem=300M DBQueryError from line
1246 of /srv/mediawiki/php-1.26wmf2/includes/db/Database.php: A database error
has occurred. Did you forget to run maintenance/update.php after upgrading? See
: https://www.mediawiki.org/wiki/Manual:Upgrading#Run_the_update_script
Query: UPDATE `filearchive` SET fa_user_text = 'John Morawski~mediawikiwiki' WH
ERE fa_user_text = 'John Morawski' AND fa_user = '12243'
Function: RenameuserSQL::rename
Error: 1205 Lock wait timeout exceeded; try restarting transaction (10.64.16.27)
```
```
2015-04-18 19:46:42 mw1015 mediawikiwiki: [32b6040b] /rpc/RunJobs.php?wiki=media
wikiwiki&type=LocalRenameUserJob&maxtime=60&maxmem=300M DBQueryError from line
1246 of /srv/mediawiki/php-1.26wmf2/includes/db/Database.php: A database error
has occurred. Did you forget to run maintenance/update.php after upgrading? See
: https://www.mediawiki.org/wiki/Manual:Upgrading#Run_the_update_script
Query: UPDATE `filearchive` SET fa_user_text = 'Jodie~mediawikiwiki' WHERE fa_u
ser_text = 'Jodie' AND fa_user = '14621'
Function: RenameuserSQL::rename
Error: 2013 Lost connection to MySQL server during query (10.64.16.27)
```
```
2015-04-18 19:47:41 mw1011 mediawikiwiki: [ae171a63] /rpc/RunJobs.php?wiki=media
wikiwiki&type=LocalRenameUserJob&maxtime=60&maxmem=300M DBQueryError from line
1246 of /srv/mediawiki/php-1.26wmf2/includes/db/Database.php: A database error
has occurred. Did you forget to run maintenance/update.php after upgrading? See
: https://www.mediawiki.org/wiki/Manual:Upgrading#Run_the_update_script
Query: UPDATE `logging` SET log_title = 'Johny~mediawikiwiki' WHERE log_type IN ('block','newusers','rights','renameuser','thanks') AND log_namespace = '2' AND log_title = 'Johny'
Function: RenameuserSQL::rename
Error: 1205 Lock wait timeout exceeded; try restarting transaction (10.64.16.27)
```
I can probably find more examples if that is helpful.