implementing Go's MySQL Driver Timeout Handling in High Concurrency Scenarios
I've encountered a strange issue with I'm working with a challenging scenario with the Go MySQL driver (github.com/go-sql-driver/mysql) where my application seems to hang indefinitely under high concurrency... I've set the `timeout` parameter in the DSN string, but it doesn't seem to affect the behavior. Here’s my connection string: ```go const dsn = "user:password@tcp(127.0.0.1:3306)/dbname?timeout=5s"``` I’m using `database/sql` to manage connections, and I have a routine that queries the database in a loop. The routine looks like this: ```go for i := 0; i < 1000; i++ { go func(id int) { defer wg.Done() db.Query("SELECT * FROM my_table WHERE id = ?", id) }(i) } wg.Wait()``` After launching my application, I noticed that it starts to exhibit a slowdown after a while and eventually hangs. The logs are showing repeated messages like `behavior 2013: Lost connection to MySQL server during query`. I’m not sure if this is related to connection timeouts or if I’m exhausting the available connections. I’ve also set the `max_open_conns` and `max_idle_conns` in my database configuration: ```go db.SetMaxOpenConns(100) db.SetMaxIdleConns(50)``` Despite these settings, the application still hangs and I need to figure out the root cause. I've tried running the queries outside of goroutines and the scenario continues, but seems less severe. Am I missing anything in terms of connection management or is there something specific to the MySQL driver that I need to handle differently in high-load situations? Any insights would be appreciated! I'm working in a Linux environment. Am I missing something obvious?