Home Database Mysql Tutorial MySQL Connector/Net 句柄泄露

MySQL Connector/Net 句柄泄露

Jun 07, 2016 pm 05:36 PM
mysql

MySQL5.5的环境,使用的Connector/Net版本是6.8.3.0,发现在打开连接异常时会有内存与句柄泄露,写了一个小程序测试一下:privatevoidHandleLeak(){DbConnection

MySQL 5.5的环境,使用的Connector/Net版本是6.8.3.0,发现在打开连接异常时会有内存与句柄泄露,写了一个小程序测试一下:


private void HandleLeak() { DbConnection conn = null; while(true) { try { //服务器能连上,但给的密码是错误的,Open时会引发Exception conn = new MySqlConnection("Server=localhost;Database=test;Uid=用户名;Pwd=错误的密码"); conn.Open(); } catch { //清理 conn.Close(); conn.Dispose(); conn = null; Console.WriteLine("Connect Error"); } finally { Thread.Sleep(1000); } } }


在任务管理器里观察句柄数一直在增长,但同样的代码,如果换成是SqlServer就没有问题。用ProcessXp看了一下,进程占用了大量的TCP连接没有关闭,处于CLOSE_WAIT状态,说明和server之间的连接没有正常关闭,此时用 netstat -ano | findstr "3306" 看一下,,能看到mysqld.exe(PID: 1900)有大量处于FIN_WAIT_2状态的连接。

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从状态上看,貌似是登录失败后server端主动断开连接,但client端没有正确关闭tcp连接导致的,具体要看一下Connector的源码,但现在手里没有,等有时间再说吧。有高手知道这个问题的麻烦给留个言。


另外试了一下,如果执行GC.Collect(),句柄就不会泄露了。



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