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RFC: Pausing a query thread


Hi guys,

I work with hosting companies and all of my clients have the same irritating problem, one query taking a lot of time to finish and consuming a lot of resources.

So I have solved the same issue but with processes on the machine by simply pausing(kill -STOP) these processes when the load is high and continuing(kill -CONT) them when the server load goes down.

I want to implement the same logic within MariaDB, so I can STOP/CONT the thread that is executing this query.

My idea is to implement this in the 'KILL query_id' function, so it will accept one more argument, which will be either STOP or CONT. If the parameter is not present, the default behavior should remain.

What do you think about my approach?


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