Critical Error Behavior

Component: Azure Cloud Service Host | Nuget: NServiceBus.Hosting.Azure (Version: 6.x)
Target NServiceBus Version: 5.x

Handling critical errors

Versions 6.2.2 and above

The Azure host is terminated on critical errors by default. When host is terminated, the Azure Fabric controller will restart the host automatically.

Versions 6.2.1 and below

The Azure host is not terminated on critical errors by default and only shuts down the bus. This would cause the role not to process messages until the role host is restarted. To address this, probably undesired behavior, implement a critical errors action that shuts down the host process instead.

// Configuring how NServiceBus handles critical errors
busConfiguration.DefineCriticalErrorAction((message, exception) =>
    var output = $"Critical exception: '{message}'";
    log.Error(output, exception);
    if (Environment.UserInteractive)
        // so that user can see on their screen the problem

    var fatalMessage = $"NServiceBus critical error:\n{message}\nShutting down.";
    Environment.FailFast(fatalMessage, exception);

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