[英]How to solve TIME_WAIT state issue when in multiple concurrency?
If I run below example on Windows I will quickly hit TCP connection limit (which I set to 64k) and get error: dial tcp 127.0.0.1:3306: connectex: Only one usage of each socket address (protocol/network address/port) is normally permitted.
如果我在Windows上运行以下示例,我将很快达到TCP连接限制(我将其设置为64k)并得到错误:
dial tcp 127.0.0.1:3306: connectex: Only one usage of each socket address (protocol/network address/port) is normally permitted.
I see all this TIME_WAIT
states waiting for there lifetime to end with: netstat -ano|findstr 3306
我看到所有这些
TIME_WAIT
状态都在等待生命周期结束: netstat -ano|findstr 3306
Why aren't connections closed immediately? 为什么不立即关闭连接?
The code: 编码:
package main
import (
_ "github.com/go-sql-driver/mysql"
"github.com/jmoiron/sqlx"
"log"
"sync"
)
var (
db_instance *sqlx.DB
wg sync.WaitGroup
)
func main() {
db, err := sqlx.Connect("mysql", "user:pass@/table")
if err != nil {
log.Fatalln(err)
}
defer db.Close()
db_instance = db
for {
for l := 0; l < 50; l++ {
wg.Add(1)
go DB_TEST()
}
wg.Wait()
}
}
func DB_TEST() {
defer wg.Done()
var s string
err := db_instance.QueryRow("SELECT NOW()").Scan(&s)
if err != nil {
log.Println(err)
return
}
log.Println(s)
}
Drafting answer from my comments discussion with @Glavić. 我与@Glavić的评论讨论的起草答案。
Utilize the SetMaxOpenConns
and SetMaxIdleConns
settings to keep TIME_WAIT
status and connections under control. 利用
SetMaxOpenConns
和SetMaxIdleConns
设置来控制TIME_WAIT
状态和连接。 If needed use SetConnMaxLifetime
too, generally it's not needed. 如果需要,也可以使用
SetConnMaxLifetime
,通常是不需要的。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.