Hangfire-Asp.Net Core 3.1-错误日志应用程序启动异常

问题描述 投票：0回答：1

最近我已经注意到，通常处于生产（在线）状态的Web应用程序出错了，我被迫手动重新启动它。

为了尝试了解web.config文件中的错误，我启用了以下条目：-stdoutLogEnabled =“ true”

今天，我（随机）注意到该应用程序已关闭并打开了日志文件，这是它的内容：

crit: Microsoft.AspNetCore.Hosting.Diagnostics[6]

      Application startup exception

MySql.Data.MySqlClient.MySqlException (0x80004005): User 'nome_database' has exceeded the 'max_user_connections' resource (current value: 10)

   at MySqlConnector.Core.ServerSession.SwitchAuthenticationAsync(ConnectionSettings cs, PayloadData payload, IOBehavior ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\Core\ServerSession.cs:line 535

   at MySqlConnector.Core.ServerSession.TryResetConnectionAsync(ConnectionSettings cs, IOBehavior ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\Core\ServerSession.cs:line 498

   at MySqlConnector.Core.ConnectionPool.GetSessionAsync(MySqlConnection connection, IOBehavior ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\Core\ConnectionPool.cs:line 72

   at MySqlConnector.Core.ConnectionPool.GetSessionAsync(MySqlConnection connection, IOBehavior ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\Core\ConnectionPool.cs:line 141

   at MySql.Data.MySqlClient.MySqlConnection.CreateSessionAsync(ConnectionPool pool, Nullable`1 ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlConnection.cs:line 645

   at MySql.Data.MySqlClient.MySqlConnection.OpenAsync(Nullable`1 ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlConnection.cs:line 312

   at MySql.Data.MySqlClient.MySqlConnection.Open() in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlConnection.cs:line 280

   at Hangfire.MySql.MySqlStorage.CreateAndOpenConnection()

   at Hangfire.MySql.MySqlStorage.UseTransaction[T](Func`2 func, Nullable`1 isolationLevel)

   at Hangfire.MySql.MySqlStorage.UseTransaction(Action`1 action)

   at Hangfire.MySql.MySqlWriteOnlyTransaction.Commit()

   at Hangfire.RecurringJobManager.AddOrUpdate(String recurringJobId, Job job, String cronExpression, RecurringJobOptions options)

   at Hangfire.RecurringJobManagerExtensions.AddOrUpdate(IRecurringJobManager manager, String recurringJobId, Job job, String cronExpression, TimeZoneInfo timeZone, String queue)

   at Hangfire.RecurringJob.AddOrUpdate[T](String recurringJobId, Expression`1 methodCall, String cronExpression, TimeZoneInfo timeZone, String queue)

   at FFM3._1.Utility.HangfireJobScheduler.ScheduleRecurringJobs(IWebHostEnvironment env) in C:\Users\Xxxx\Xxxx\XXX\XXX\XXX\Utility\HangfireJobScheduler.cs:line 23

   at FFM3._1.Startup.Configure(IApplicationBuilder app, IWebHostEnvironment env, IServiceProvider serviceProvider) in C:\Users\Xxxx\Xxxx\XXX\XXX\XXX\Startup.cs:line 170

   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)

   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

   at Microsoft.AspNetCore.Hosting.ConfigureBuilder.Invoke(Object instance, IApplicationBuilder builder)

   at Microsoft.AspNetCore.Hosting.ConfigureBuilder.<>c__DisplayClass4_0.<Build>b__0(IApplicationBuilder builder)

   at Microsoft.AspNetCore.Hosting.GenericWebHostBuilder.<>c__DisplayClass13_0.<UseStartup>b__2(IApplicationBuilder app)

   at Microsoft.AspNetCore.Mvc.Filters.MiddlewareFilterBuilderStartupFilter.<>c__DisplayClass0_0.<Configure>g__MiddlewareFilterBuilder|0(IApplicationBuilder builder)

   at Microsoft.AspNetCore.Server.IIS.Core.IISServerSetupFilter.<>c__DisplayClass2_0.<Configure>b__0(IApplicationBuilder app)

   at Microsoft.AspNetCore.HostFilteringStartupFilter.<>c__DisplayClass0_0.<Configure>b__0(IApplicationBuilder app)

   at Microsoft.AspNetCore.Hosting.GenericWebHostService.StartAsync(CancellationToken cancellationToken)

Unhandled exception. MySql.Data.MySqlClient.MySqlException (0x80004005): User 'nome_database' has exceeded the 'max_user_connections' resource (current value: 10)

   at MySqlConnector.Core.ServerSession.SwitchAuthenticationAsync(ConnectionSettings cs, PayloadData payload, IOBehavior ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\Core\ServerSession.cs:line 535

   at MySqlConnector.Core.ServerSession.TryResetConnectionAsync(ConnectionSettings cs, IOBehavior ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\Core\ServerSession.cs:line 498

   at MySqlConnector.Core.ConnectionPool.GetSessionAsync(MySqlConnection connection, IOBehavior ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\Core\ConnectionPool.cs:line 72

   at MySqlConnector.Core.ConnectionPool.GetSessionAsync(MySqlConnection connection, IOBehavior ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\Core\ConnectionPool.cs:line 141

   at MySql.Data.MySqlClient.MySqlConnection.CreateSessionAsync(ConnectionPool pool, Nullable`1 ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlConnection.cs:line 645

   at MySql.Data.MySqlClient.MySqlConnection.OpenAsync(Nullable`1 ioBehavior, CancellationToken cancellationToken) in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlConnection.cs:line 312

   at MySql.Data.MySqlClient.MySqlConnection.Open() in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlConnection.cs:line 280

   at Hangfire.MySql.MySqlStorage.CreateAndOpenConnection()

   at Hangfire.MySql.MySqlStorage.UseTransaction[T](Func`2 func, Nullable`1 isolationLevel)

   at Hangfire.MySql.MySqlStorage.UseTransaction(Action`1 action)

   at Hangfire.MySql.MySqlWriteOnlyTransaction.Commit()

   at Hangfire.RecurringJobManager.AddOrUpdate(String recurringJobId, Job job, String cronExpression, RecurringJobOptions options)

   at Hangfire.RecurringJobManagerExtensions.AddOrUpdate(IRecurringJobManager manager, String recurringJobId, Job job, String cronExpression, TimeZoneInfo timeZone, String queue)

   at Hangfire.RecurringJob.AddOrUpdate[T](String recurringJobId, Expression`1 methodCall, String cronExpression, TimeZoneInfo timeZone, String queue)

   at FFM3._1.Utility.HangfireJobScheduler.ScheduleRecurringJobs(IWebHostEnvironment env) in C:\Users\Xxxx\Xxxx\XXX\XXX\XXX\Utility\HangfireJobScheduler.cs:line 23

   at FFM3._1.Startup.Configure(IApplicationBuilder app, IWebHostEnvironment env, IServiceProvider serviceProvider) in C:\Users\Xxxx\Xxxx\XXX\XXX\XXX\Startup.cs:line 170

   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor, Boolean wrapExceptions)

   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)

   at Microsoft.AspNetCore.Hosting.ConfigureBuilder.Invoke(Object instance, IApplicationBuilder builder)

   at Microsoft.AspNetCore.Hosting.ConfigureBuilder.<>c__DisplayClass4_0.<Build>b__0(IApplicationBuilder builder)

   at Microsoft.AspNetCore.Hosting.GenericWebHostBuilder.<>c__DisplayClass13_0.<UseStartup>b__2(IApplicationBuilder app)

   at Microsoft.AspNetCore.Mvc.Filters.MiddlewareFilterBuilderStartupFilter.<>c__DisplayClass0_0.<Configure>g__MiddlewareFilterBuilder|0(IApplicationBuilder builder)

   at Microsoft.AspNetCore.Server.IIS.Core.IISServerSetupFilter.<>c__DisplayClass2_0.<Configure>b__0(IApplicationBuilder app)

   at Microsoft.AspNetCore.HostFilteringStartupFilter.<>c__DisplayClass0_0.<Configure>b__0(IApplicationBuilder app)

   at Microsoft.AspNetCore.Hosting.GenericWebHostService.StartAsync(CancellationToken cancellationToken)

   at Microsoft.Extensions.Hosting.Internal.Host.StartAsync(CancellationToken cancellationToken)

   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token)

   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.RunAsync(IHost host, CancellationToken token)

   at Microsoft.Extensions.Hosting.HostingAbstractionsHostExtensions.Run(IHost host)

   at FFM3._1.Program.Main(String[] args) in C:\Users\Xxxx\Xxxx\XXX\XXX\XXX\Program.cs:line 16

我相信问题出在使用hangfire（或者可能是错误的配置）。

我正在使用Asp.Net Core 3.1，并且正在将MySql用作数据库。

下面我报告我在Startup.cs文件的ConfigureServices方法中输入的内容

services.AddHangfire(configuration => configuration.SetDataCompatibilityLevel(CompatibilityLevel.Version_170)
                                                               .UseSimpleAssemblyNameTypeSerializer()
                                                               .UseRecommendedSerializerSettings()
                                                               .UseStorage(new MySqlStorage(Configuration.GetConnectionString("DefaultConnection"), new MySqlStorageOptions()
                                                               {
                                                                   TablesPrefix = "Hangfire"
                                                               })));
            services.AddHangfireServer();

下面我报告我在Startup.cs文件的Configure方法中输入的内容

app.UseHangfireDashboard("/hangfire", new DashboardOptions
            {
                Authorization = new[] { new HangfireAuthorizationFilter() }
            });
            HangfireJobScheduler.ScheduleRecurringJobs(env);

希望从日志中可以给我一些指示，以帮助我解决此问题。

我先谢谢你。

mysql asp.net-core hangfire pomelo-entityframeworkcore-mysql
1个回答
0
投票
默认情况下，在MySqlConnector（这是Pomelo使用的基础库）中启用了连接池，并开放到100个连接（maxpoolsize连接字符串选项）。

如果您以某种方式配置了MySQL数据库，使其无法处理那么多连接，并且您最近发现了这些异常，那么您可能比以前拥有更多的流量，并且超出了配置值（并发连接数比max_connections更多）。

要解决此问题，只需以某种方式配置连接池，即不要超过MySQL的max_connections值，或者以某种方式配置MySQL，以允许更多连接（请参阅max_connections）或最后一种方法）在一定时间后强制关闭已经打开的（可能是过时的）连接（请参阅wait_timeout和interactive_timeout）。

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