Use pt-heartbeat info as measure of lag for tools that self-throttle based on lag

Registered by markus_albe on 2013-11-14

Tools like pt-table-checksum, pt-online-schema-change and others in the toolkit relay on Seconds_behind_master for lag detection, which sometimes is very unreliable and causes unnecesary delays. A good alternative would be to check pt-heartbeat timings (for those who have it enabled or that would like to enable during operations done with one of these tools). The tool could actually setup and start pt-heartbeat on behalf of the user, and run it only during it's execution.

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