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packets: reset read deadline before conn check (#964)
* packets: reset read deadline before conn check If a MySQL connection has been configured with a short `ReadTimeout`, each read from the TCP connection will be preceded by a `SetReadDeadline` call, which lingers until the next `SetReadDeadline`. This can be an issue if the connection becomes stale after staying too long in the connection pool, because when we attempt to perform a stale connection check, the Go runtime scheduler will return a timedout error from the scheduler itself, without letting us get to the kernel to perform the non-blocking read. To fix this, reset the read deadline before we perform the connection check. * packets: set a 0 deadline
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