Toolserver:Admin:Fix broken replication
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When replication breaks, use SHOW SLAVE STATUS\G to find the error. Fix whatever caused it, then restart replication: STOP SLAVE; START SLAVE;.
If the error is Lock wait timeout, it means a running query blocked the replication thread. After restarting replication, check that it's actually replicating. If not, find and kill the query that's blocking it.