Oh crap, replication between my media wiki server in datacenter 1 and in datacenter 2 has for some reason stopped working.
Logging into the slave server, I was able to verify this was in fact by typing the following and looking for the two SLAVE specific lines.
mysql> show slave status \G
Slave_IO_Running: No Slave_SQL_Running: No
So I stopped the slave with the following command. Note that this does not stop the database, rather it just stops the slave from attempting to replicate
mysql> stop slave;
Then go onto the master and get the current log file and log file position. This information is used later to sync the slave with the master.
mysql> show master status \g
mysql-bin.000004 | 90171568
Now freeze the master.
mysql> flush tables with read lock; (dont close this window)
Then in a new console on the master and dump out the database.