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Displaying posts with tag: Seconds_Behind_Master (reset)

Seconds_Behind_Master fluctuating wildly? Check for events caught in a loop
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Recently I was working with a customer where we noticed that Seconds_Behind_Master fluctuating from an expected value of 0 seconds behind to a fairly high six figure value.  The servers were configured in a master-master relationship and used 5 figure server_id values, and we had just migrated this cluster from one data centre to another by re-pointing masters.  Seeing large fluctuations in Seconds_Behind_Master can often be explained by long running queries being processed by the SQL_THREAD, however SHOW PROCESSLIST indicated that there were no long running replication events, and we had no other indication that the server was lagging  due to resource constraints — CPU, disk, and memory were under-utilized.

We then moved our investigation to manual review of the binary log where events appeared normal (5 digit server_id

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