how to renew lock for a very long processing message on the fly

is it possible to renew lock for a message under process in Azure.Messaging.ServiceBus library, if yes how

CodePudding user response：

Depending on what you use, you need to extend the lock. Using the processor provided by the Service Bus SDK you've mentioned, it can be done in the following way:

await using var client = new ServiceBusClient(connectionString);

// create the options to use for configuring the processor
var options = new ServiceBusProcessorOptions
{
    MaxAutoLockRenewalDuration = TimeSpan.FromMinutes(45); // Allow message processing for up-to 45 minutes
    AutoCompleteMessages = false,

    // Disable multi-threading for easy debugging
    MaxConcurrentCalls = 1
};

await using ServiceBusProcessor processor = client.CreateProcessor(queueName, options);

processor.ProcessMessageAsync  = MessageHandler;
processor.ProcessErrorAsync  = ErrorHandler;

async Task MessageHandler(ProcessMessageEventArgs args)
{
    string body = args.Message.Body.ToString();
    Console.WriteLine(body);

    await args.CompleteMessageAsync(args.Message);
}

Task ErrorHandler(ProcessErrorEventArgs args)
{
    Console.WriteLine(args.ErrorSource);

    Console.WriteLine(args.FullyQualifiedNamespace);
    Console.WriteLine(args.EntityPath);

    Console.WriteLine(args.Exception.ToString());

    return Task.CompletedTask;
}

processor.StartProcessingAsync();
Console.ReadKey();

They key is the MaxAutoLockRenewalDuration property that needs to be set to the maximum possible time.

In case you're using ServiceBusReceiver, it provides RenewMessageLockAsync method to achieve the goal.

CodePudding user response：

Message lock renewal is only applied to messages that are actively processed by endpoints and do not apply to messages that have been prefetched.

The message lock renewal time should be longer than the LockDuration time.

The Azure Service Bus transport will send a lock renewal request to the broker when the LockDuration period is about to expire, keeping the message locked and invisible to other consumers.

While the total time of message processing is less than the auto-renewal time set by Azure Service Bus transport, lock renewal will occur automatically.

The lock renewal time is set to 5 minutes by default. The DeliveryCount of the processed message will not rise if the auto-lock is renewed.

The message lock is renewed for the message that is presently being handled. When prefetched messages are completed by the transport, they will lose their lock if they are not handled within the LockDuration time. This will be signaled by a LockLostException in the log. Prefetching can be deactivated to avoid the lock renewal exception by setting PrefetchCount to zero.

Configuring message to lock renewal

var ServiceBusTransport= endpointConfiguration.UseTransport<AzureServiceBusTransport>(); 
var ServiceBusReceivers = ServiceBusTransport.MessageReceivers(); 
ServiceBusReceivers .AutoRenewTimeout(maximumProcessingTime);

Refer here for more information.