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It appears overnight our Master RDS mysql server went offline for 3-4 minutes. When it came back online the replication was broken.

On the slave, issuing SHOW SLAVE STATUS\G;

"Got fatal error 1236 from master when reading data from binary log: 'Client requested master to start replication from impossible position'"

In AWS monitoring, slave lag shows "-1.0".

Is there a way to get the slave replication restarted, or should I just create a new slave?

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There's really no harm in just spooling up a new slave, so I'd go that route.

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