执行“服务器心跳”-负载均衡时出错

Question

我有以下内容： - 在负载平衡设置中运行的 2 个 Web 服务器。 - 其中每一个都可以在 OwinStartup.cs 中使用以下代码将 Recurring Jobs 排入队列：

GlobalConfiguration.Configuration.UseSqlServerStorage("ConnectionString")
                .UseFilter(new LogFailureAttribute());
            app.UseHangfireServer();

 RecurringJob.AddOrUpdate("Job", () =>FunctionTrigger(), Cron.Daily(5, 0));

FunctionTrigger 是一个使用无状态事务会话将记录插入数据库的简单函数。

所以当我使用一台服务器时，作业运行成功，但是在负载平衡中发生错误并且没有记录插入到数据库中。

这是日志错误：

Hangfire.Server.ServerHeartbeat - Error occurred during execution of 'Server Heartbeat' component. Execution will be retried (attempt 2 of 2147483647) in 00:00:03 seconds.
System.InvalidOperationException: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.
at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection)
at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource1 retry, DbConnectionOptions userOptions)
at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource1 retry)
at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource1 retry)
at System.Data.SqlClient.SqlConnection.Open()
at Hangfire.SqlServer.SqlServerStorage.GetConnection()
at Hangfire.Server.ServerHeartbeat.Execute(CancellationToken cancellationToken)
at Hangfire.Server.AutomaticRetryServerComponentWrapper.ExecuteWithAutomaticRetry(CancellationToken cancellationToken)

我正在使用 Hangfire 1.4.5

**这是因为作业在每台服务器上运行两次吗？！我怎样才能避免这种情况。 ？！ ** 谢谢。

Answer 1

我也遇到过同样的问题，经过一番搜索，我在hangfire discussion 上找到了这个讨论，Hangfire 版本 release 上得到修复。 如果您仍然遇到问题，希望对您有所帮助。