EF Core 和 Pomelo 的 SocketException (995)
SocketException (995) with EF Core and Pomelo
我的应用程序有时会抛出这个异常：
MySqlConnector.MySqlException (0x80004005): Connect Timeout expired. All pooled connections are in use.
我从我的托管服务提供商那里发现我的应用程序 mysql 中有很多空闲连接。
因此，我尝试通过在连接字符串中添加 POOLING=FALSE 来禁用池化。相反，我得到了以下异常。
---> MySqlConnector.MySqlException (0x80004005): The Command Timeout expired before the operation completed.
---> System.IO.IOException: Unable to read data from the transport connection: The I/O operation has been aborted because of either a thread exit or an application request..
---> System.Net.Sockets.SocketException (995): The I/O operation has been aborted because of either a thread exit or an application request.
--- End of inner exception stack trace ---
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken)
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.GetResult(Int16 token)
at System.Net.Security.SslStream.<FillBufferAsync>g__InternalFillBufferAsync|215_0[TReadAdapter](TReadAdapter adap, ValueTask`1 task, Int32 min, Int32 initial)
at System.Net.Security.SslStream.ReadAsyncInternal[TReadAdapter](TReadAdapter adapter, Memory`1 buffer)
at MySqlConnector.Protocol.Serialization.StreamByteHandler.<ReadBytesAsync>g__DoReadBytesAsync|6_2(Memory`1 buffer) in /_/src/MySqlConnector/Protocol/Serialization/StreamByteHandler.cs:line 89
at MySqlConnector.Protocol.Serialization.StreamByteHandler.<ReadBytesAsync>g__DoReadBytesAsync|6_2(Memory`1 buffer) in /_/src/MySqlConnector/Protocol/Serialization/StreamByteHandler.cs:line 89
at MySqlConnector.Protocol.Serialization.BufferedByteReader.ReadBytesAsync(IByteHandler byteHandler, ArraySegment`1 buffer, Int32 totalBytesToRead, IOBehavior ioBehavior) in /_/src/MySqlConnector/Protocol/Serialization/BufferedByteReader.cs:line 36
at MySqlConnector.Protocol.Serialization.ProtocolUtility.<ReadPacketAsync>g__AddContinuation|1_0(ValueTask`1 headerBytes, BufferedByteReader bufferedByteReader, IByteHandler byteHandler, Func`1 getNextSequenceNumber, ProtocolErrorBehavior protocolErrorBehavior, IOBehavior ioBehavior) in /_/src/MySqlConnector/Protocol/Serialization/ProtocolUtility.cs:line 412
at MySqlConnector.Protocol.Serialization.ProtocolUtility.<DoReadPayloadAsync>g__AddContinuation|5_0(ValueTask`1 readPacketTask, BufferedByteReader bufferedByteReader, IByteHandler byteHandler, Func`1 getNextSequenceNumber, ArraySegmentHolder`1 previousPayloads, ProtocolErrorBehavior protocolErrorBehavior, IOBehavior ioBehavior) in /_/src/MySqlConnector/Protocol/Serialization/ProtocolUtility.cs:line 483
at MySqlConnector.Core.ServerSession.ReceiveReplyAsyncAwaited(ValueTask`1 task) in /_/src/MySqlConnector/Core/ServerSession.cs:line 890
at MySqlConnector.Core.ResultSet.ReadResultSetHeaderAsync(IOBehavior ioBehavior) in /_/src/MySqlConnector/Core/ResultSet.cs:line 50
at MySqlConnector.MySqlDataReader.ActivateResultSet(CancellationToken cancellationToken) in /_/src/MySqlConnector/MySqlDataReader.cs:line 119
at MySqlConnector.MySqlDataReader.CreateAsync(CommandListPosition commandListPosition, ICommandPayloadCreator payloadCreator, IDictionary`2 cachedProcedures, IMySqlCommand command, CommandBehavior behavior, IOBehavior ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/MySqlDataReader.cs:line 445
at MySqlConnector.Core.CommandExecutor.ExecuteReaderAsync(IReadOnlyList`1 commands, ICommandPayloadCreator payloadCreator, CommandBehavior behavior, IOBehavior ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/Core/CommandExecutor.cs:line 60
at MySqlConnector.MySqlCommand.ExecuteReaderAsync(CommandBehavior behavior, IOBehavior ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/MySqlCommand.cs:line 315
at MySqlConnector.MySqlCommand.ExecuteDbDataReaderAsync(CommandBehavior behavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/MySqlCommand.cs:line 307
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.AsyncEnumerator.InitializeReaderAsync(DbContext _, Boolean result, CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.Storage.ExecutionStrategy.ExecuteImplementationAsync[TState,TResult](Func`4 operation, Func`4 verifySucceeded, TState state, CancellationToken cancellationToken)
--- End of inner exception stack trace ---
at Microsoft.EntityFrameworkCore.Storage.ExecutionStrategy.ExecuteImplementationAsync[TState,TResult](Func`4 operation, Func`4 verifySucceeded, TState state, CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.AsyncEnumerator.MoveNextAsync()
at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ToListAsync[TSource](IQueryable`1 source, CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ToListAsync[TSource](IQueryable`1 source, CancellationToken cancellationToken)
at Microsoft.AspNetCore.Identity.EntityFrameworkCore.UserStore`9.GetRolesAsync(TUser user, CancellationToken cancellationToken)
at Microsoft.AspNetCore.Identity.UserManager`1.GetRolesAsync(TUser user)
at Microsoft.AspNetCore.Identity.UserClaimsPrincipalFactory`2.GenerateClaimsAsync(TUser user)
at Microsoft.AspNetCore.Identity.UserClaimsPrincipalFactory`1.CreateAsync(TUser user)
at Microsoft.AspNetCore.Identity.SignInManager`1.CreateUserPrincipalAsync(TUser user)
at Microsoft.AspNetCore.Identity.SecurityStampValidator`1.SecurityStampVerified(TUser user, CookieValidatePrincipalContext context)
at Microsoft.AspNetCore.Identity.SecurityStampValidator`1.ValidateAsync(CookieValidatePrincipalContext context)
at Microsoft.AspNetCore.Authentication.Cookies.CookieAuthenticationHandler.HandleAuthenticateAsync()
at Microsoft.AspNetCore.Authentication.AuthenticationHandler`1.AuthenticateAsync()
at Microsoft.AspNetCore.Authentication.AuthenticationService.AuthenticateAsync(HttpContext context, String scheme)
at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.ResponseCompression.ResponseCompressionMiddleware.Invoke(HttpContext context)
我想知道导致此异常的原因以及处理空闲 mysql 连接问题的更好方法是什么。
1.Connection 超时=300（时间以秒为单位）
2.Default 命令超时=300（时间以秒为单位）
像这样使用你的连接：-
"ConnectionStrings": {
"DefaultConnection": "server=localhost; port=3306; database=dbname; user=username; password=yourpassword; Persist Security Info=False; Connect Timeout=300;default command timeout=300"
}
或者
"server=yourservername;userid=xxxxx;password=xxxxx;database=xxxxx;Connection Timeout=300;default command timeout=300"
或者您可以定义启动时超时 class 如下：-
services.AddDbContext<YourDbContextName>(options =>
options.UseMySql(
Configuration.GetConnectionString("DefaultConnection"), o => o.CommandTimeout(180)));
它将解决您的问题。
Hence I tried disabled pooling by adding POOLING=FALSE in the connection string. Instead I got the following exception.
您得到 ---> MySqlConnector.MySqlException (0x80004005): The Command Timeout expired before the operation completed. 异常的原因可能是最大。您的 MySQL 实例的连接已经耗尽。
如果您不想重新配置您的 MySQL 实例，让您的应用程序达到 运行 的最简单方法是禁用连接池（就像您已经做的那样），然后重新启动您的服务器（以确保旧代码中没有仍然存在的连接阻止您连接）。
如果你毕竟想使用连接池，你可能还想看看 MySqlConnector 的 Connection Pooling Options。
它们包含用于管理连接池的连接数及其生命周期的选项（默认数量为 100，默认生命周期为无限）。
特别仔细看看MaxPoolSize和ConnectionIdleTimeout。
此外，请确保您的连接字符串没有更改。 MySqlConnector（因此 Pomelo）为每个唯一的连接字符串使用专用连接池。
除此之外，在 MySQL 数据库级别，您可以使用 wait_timeout 选项在特定超时后强制关闭连接。
它的默认值通常是 28800（8 小时）。
我的应用程序有时会抛出这个异常：
MySqlConnector.MySqlException (0x80004005): Connect Timeout expired. All pooled connections are in use.
我从我的托管服务提供商那里发现我的应用程序 mysql 中有很多空闲连接。
因此，我尝试通过在连接字符串中添加 POOLING=FALSE 来禁用池化。相反，我得到了以下异常。
---> MySqlConnector.MySqlException (0x80004005): The Command Timeout expired before the operation completed.
---> System.IO.IOException: Unable to read data from the transport connection: The I/O operation has been aborted because of either a thread exit or an application request..
---> System.Net.Sockets.SocketException (995): The I/O operation has been aborted because of either a thread exit or an application request.
--- End of inner exception stack trace ---
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error, CancellationToken cancellationToken)
at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.GetResult(Int16 token)
at System.Net.Security.SslStream.<FillBufferAsync>g__InternalFillBufferAsync|215_0[TReadAdapter](TReadAdapter adap, ValueTask`1 task, Int32 min, Int32 initial)
at System.Net.Security.SslStream.ReadAsyncInternal[TReadAdapter](TReadAdapter adapter, Memory`1 buffer)
at MySqlConnector.Protocol.Serialization.StreamByteHandler.<ReadBytesAsync>g__DoReadBytesAsync|6_2(Memory`1 buffer) in /_/src/MySqlConnector/Protocol/Serialization/StreamByteHandler.cs:line 89
at MySqlConnector.Protocol.Serialization.StreamByteHandler.<ReadBytesAsync>g__DoReadBytesAsync|6_2(Memory`1 buffer) in /_/src/MySqlConnector/Protocol/Serialization/StreamByteHandler.cs:line 89
at MySqlConnector.Protocol.Serialization.BufferedByteReader.ReadBytesAsync(IByteHandler byteHandler, ArraySegment`1 buffer, Int32 totalBytesToRead, IOBehavior ioBehavior) in /_/src/MySqlConnector/Protocol/Serialization/BufferedByteReader.cs:line 36
at MySqlConnector.Protocol.Serialization.ProtocolUtility.<ReadPacketAsync>g__AddContinuation|1_0(ValueTask`1 headerBytes, BufferedByteReader bufferedByteReader, IByteHandler byteHandler, Func`1 getNextSequenceNumber, ProtocolErrorBehavior protocolErrorBehavior, IOBehavior ioBehavior) in /_/src/MySqlConnector/Protocol/Serialization/ProtocolUtility.cs:line 412
at MySqlConnector.Protocol.Serialization.ProtocolUtility.<DoReadPayloadAsync>g__AddContinuation|5_0(ValueTask`1 readPacketTask, BufferedByteReader bufferedByteReader, IByteHandler byteHandler, Func`1 getNextSequenceNumber, ArraySegmentHolder`1 previousPayloads, ProtocolErrorBehavior protocolErrorBehavior, IOBehavior ioBehavior) in /_/src/MySqlConnector/Protocol/Serialization/ProtocolUtility.cs:line 483
at MySqlConnector.Core.ServerSession.ReceiveReplyAsyncAwaited(ValueTask`1 task) in /_/src/MySqlConnector/Core/ServerSession.cs:line 890
at MySqlConnector.Core.ResultSet.ReadResultSetHeaderAsync(IOBehavior ioBehavior) in /_/src/MySqlConnector/Core/ResultSet.cs:line 50
at MySqlConnector.MySqlDataReader.ActivateResultSet(CancellationToken cancellationToken) in /_/src/MySqlConnector/MySqlDataReader.cs:line 119
at MySqlConnector.MySqlDataReader.CreateAsync(CommandListPosition commandListPosition, ICommandPayloadCreator payloadCreator, IDictionary`2 cachedProcedures, IMySqlCommand command, CommandBehavior behavior, IOBehavior ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/MySqlDataReader.cs:line 445
at MySqlConnector.Core.CommandExecutor.ExecuteReaderAsync(IReadOnlyList`1 commands, ICommandPayloadCreator payloadCreator, CommandBehavior behavior, IOBehavior ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/Core/CommandExecutor.cs:line 60
at MySqlConnector.MySqlCommand.ExecuteReaderAsync(CommandBehavior behavior, IOBehavior ioBehavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/MySqlCommand.cs:line 315
at MySqlConnector.MySqlCommand.ExecuteDbDataReaderAsync(CommandBehavior behavior, CancellationToken cancellationToken) in /_/src/MySqlConnector/MySqlCommand.cs:line 307
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.AsyncEnumerator.InitializeReaderAsync(DbContext _, Boolean result, CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.Storage.ExecutionStrategy.ExecuteImplementationAsync[TState,TResult](Func`4 operation, Func`4 verifySucceeded, TState state, CancellationToken cancellationToken)
--- End of inner exception stack trace ---
at Microsoft.EntityFrameworkCore.Storage.ExecutionStrategy.ExecuteImplementationAsync[TState,TResult](Func`4 operation, Func`4 verifySucceeded, TState state, CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable`1.AsyncEnumerator.MoveNextAsync()
at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ToListAsync[TSource](IQueryable`1 source, CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ToListAsync[TSource](IQueryable`1 source, CancellationToken cancellationToken)
at Microsoft.AspNetCore.Identity.EntityFrameworkCore.UserStore`9.GetRolesAsync(TUser user, CancellationToken cancellationToken)
at Microsoft.AspNetCore.Identity.UserManager`1.GetRolesAsync(TUser user)
at Microsoft.AspNetCore.Identity.UserClaimsPrincipalFactory`2.GenerateClaimsAsync(TUser user)
at Microsoft.AspNetCore.Identity.UserClaimsPrincipalFactory`1.CreateAsync(TUser user)
at Microsoft.AspNetCore.Identity.SignInManager`1.CreateUserPrincipalAsync(TUser user)
at Microsoft.AspNetCore.Identity.SecurityStampValidator`1.SecurityStampVerified(TUser user, CookieValidatePrincipalContext context)
at Microsoft.AspNetCore.Identity.SecurityStampValidator`1.ValidateAsync(CookieValidatePrincipalContext context)
at Microsoft.AspNetCore.Authentication.Cookies.CookieAuthenticationHandler.HandleAuthenticateAsync()
at Microsoft.AspNetCore.Authentication.AuthenticationHandler`1.AuthenticateAsync()
at Microsoft.AspNetCore.Authentication.AuthenticationService.AuthenticateAsync(HttpContext context, String scheme)
at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.ResponseCompression.ResponseCompressionMiddleware.Invoke(HttpContext context)
我想知道导致此异常的原因以及处理空闲 mysql 连接问题的更好方法是什么。
1.Connection 超时=300（时间以秒为单位）
2.Default 命令超时=300（时间以秒为单位）
像这样使用你的连接：-
"ConnectionStrings": {
"DefaultConnection": "server=localhost; port=3306; database=dbname; user=username; password=yourpassword; Persist Security Info=False; Connect Timeout=300;default command timeout=300"
}
或者
"server=yourservername;userid=xxxxx;password=xxxxx;database=xxxxx;Connection Timeout=300;default command timeout=300"
或者您可以定义启动时超时 class 如下：-
services.AddDbContext<YourDbContextName>(options =>
options.UseMySql(
Configuration.GetConnectionString("DefaultConnection"), o => o.CommandTimeout(180)));
它将解决您的问题。
Hence I tried disabled pooling by adding
POOLING=FALSEin the connection string. Instead I got the following exception.
您得到 ---> MySqlConnector.MySqlException (0x80004005): The Command Timeout expired before the operation completed. 异常的原因可能是最大。您的 MySQL 实例的连接已经耗尽。
如果您不想重新配置您的 MySQL 实例，让您的应用程序达到 运行 的最简单方法是禁用连接池（就像您已经做的那样），然后重新启动您的服务器（以确保旧代码中没有仍然存在的连接阻止您连接）。
如果你毕竟想使用连接池，你可能还想看看 MySqlConnector 的 Connection Pooling Options。
它们包含用于管理连接池的连接数及其生命周期的选项（默认数量为 100，默认生命周期为无限）。
特别仔细看看MaxPoolSize和ConnectionIdleTimeout。
此外，请确保您的连接字符串没有更改。 MySqlConnector（因此 Pomelo）为每个唯一的连接字符串使用专用连接池。
除此之外，在 MySQL 数据库级别，您可以使用 wait_timeout 选项在特定超时后强制关闭连接。
它的默认值通常是 28800（8 小时）。