Azure 函数（服务总线触发器）System.OperationCanceledException

Question

我有一个 Azure Function (.net 6.0) 从服务总线接收消息。 99% 的消息处理正常，但有时我会在 Application Insights 中收到 System.OperationCanceledException。

调用堆栈：

System.OperationCanceledException:
   at Microsoft.Azure.WebJobs.ServiceBus.MessageProcessor.CompleteProcessingMessageAsync (Microsoft.Azure.WebJobs.Extensions.ServiceBus, Version=5.5.1.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at Microsoft.Azure.WebJobs.ServiceBus.Listeners.ServiceBusListener+<ProcessMessageAsync>d__26.MoveNext (Microsoft.Azure.WebJobs.Extensions.ServiceBus, Version=5.5.1.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Messaging.ServiceBus.ServiceBusProcessor+<OnProcessMessageAsync>d__104.MoveNext (Azure.Messaging.ServiceBus, Version=7.8.1.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Messaging.ServiceBus.ReceiverManager+<OnMessageHandler>d__19.MoveNext (Azure.Messaging.ServiceBus, Version=7.8.1.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e)
   at Azure.Messaging.ServiceBus.ReceiverManager+<ProcessOneMessage>d__15.MoveNext (Azure.Messaging.ServiceBus, Version=7.8.1.0, Culture=neutral, PublicKeyToken=92742159e12e44c8)

调用堆栈（只是我的代码）：

System.OperationCanceledException
Microsoft.Azure.WebJobs.ServiceBus.MessageProcessor.CompleteProcessingMessageAsync
[external code]
Azure.Messaging.ServiceBus.ServiceBusProcessor+<OnProcessMessageAsync>d__104.MoveNext
[external code]
Azure.Messaging.ServiceBus.ReceiverManager+<OnMessageHandler>d__19.MoveNext
[external code]
Azure.Messaging.ServiceBus.ReceiverManager+<ProcessOneMessage>d__15.MoveNext

看FormattedMessage：好像是在ProcessMessageCallback上失败了。我查了一下，唯一能找到的信息是：Errors thrown from the user's processMessage callback passed to subscribe.

失败的方法是：Azure.Messaging.ServiceBus.ServiceBusProcessor+d__104.MoveNext

对我来说，这是一个 ServiceBus 问题，而不是我的代码。我正在使用 Microsoft.Azure.WebJobs.Extensions.ServiceBus v5.5.1.

有没有其他人遇到过这个问题或知道如何解决这个问题？

更新： 我添加了异常处理，希望能获取更多信息：

    catch (OperationCanceledException ex)
    {
        throw new OperationCanceledException(ex.Message);
    }
    catch (Exception ex)
    {
        throw new ApplicationException(ex.Message);
    }

Answer 1

当功能主机试图停止或回收实例时，例如在缩减期间，可能会发生这种情况。如果该函数在 3 个实例上运行并且正在扩展以在 2 个实例上运行，则被“杀死”的实例将被取消。