Question

我刚刚将我的NHibernate应用程序从SQL Server迁移到了MySql。一切似乎都很好，除了我得到间歇性的TimeoutExceptions。我可以使用MySql甚至one blog post找到关于超时的大量信息，关于使用Hibernate + MySql + C3PO（无论是什么）的超时。但没有关于如何调整NHib来阻止这个问题。你知道吗？

这是堆栈跟踪：

NHibernate.TransactionException: Begin failed with SQL exception ---> System.TimeoutException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond ---> System.IO.IOException: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
   at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   --- End of inner exception stack trace ---
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   at MyNetworkStream.Read(Byte[] buffer, Int32 offset, Int32 count)
   --- End of inner exception stack trace ---
   at MyNetworkStream.HandleOrRethrowException(Exception e)
   at MyNetworkStream.Read(Byte[] buffer, Int32 offset, Int32 count)
   at MySql.Data.MySqlClient.TimedStream.Read(Byte[] buffer, Int32 offset, Int32 count)
   at System.IO.BufferedStream.Read(Byte[] array, Int32 offset, Int32 count)
   at MySql.Data.MySqlClient.MySqlStream.ReadFully(Stream stream, Byte[] buffer, Int32 offset, Int32 count)
   at MySql.Data.MySqlClient.MySqlStream.LoadPacket()
   at MySql.Data.MySqlClient.MySqlStream.ReadPacket()
   at MySql.Data.MySqlClient.NativeDriver.ReadOk(Boolean read)
   at MySql.Data.MySqlClient.NativeDriver.SetDatabase(String dbName)
   at MySql.Data.MySqlClient.Driver.SetDatabase(String dbName)
   at MySql.Data.MySqlClient.MySqlConnection.ChangeDatabase(String databaseName)
   at MySql.Data.MySqlClient.MySqlConnection.Open()
   at NHibernate.Connection.DriverConnectionProvider.GetConnection()
   at NHibernate.AdoNet.ConnectionManager.GetConnection()
   at NHibernate.Impl.SessionImpl.get_Connection()
   at NHibernate.Transaction.AdoTransaction.Begin(IsolationLevel isolationLevel)
   --- End of inner exception stack trace ---
   at NHibernate.Transaction.AdoTransaction.Begin(IsolationLevel isolationLevel)
   at NHibernate.Transaction.AdoTransaction.Begin()
   at NHibernate.AdoNet.ConnectionManager.BeginTransaction()
   at NHibernate.Impl.SessionImpl.BeginTransaction()

Answer 1

我使用MYSQL数据库在Rackspace云上运行NHibernate。我发现由于睡眠导致连接处于半开状态，我正在超时。最终我的连接不多了，我的网站超时了。

最后，我在我的连接字符串中添加了Pooling=false;。我不确定这是否是最终修复，但它已经解决了我的问题。

您可以在MySQL编辑器中使用show processlist来检查睡眠连接...

NHibernate + MySql Intermittent TimeoutException

1 个答案: