Azure service bus - Renew lock is not working properly

Question

Sometimes lock is not being renewed automatically. Please let me know if i am doing any mistake. I am using Microsoft.Azure.ServiceBus library (v3.4.0) and below is my code snippet.

var client = new QueueClient(connectionString, queueName, ReceiveMode.PeekLock);
            client.RegisterMessageHandler(async (message, token) =>
            {
                var logger = new AzureLogger();
                logger.Debug("----------------------------------------------------------------------------");
                logger.Debug("Message received.");
                var body = Encoding.UTF8.GetString(message.Body);
                logger.Debug($"Message : {body}");
                try
                {
                    for (int i = 1; i <= 30; i++)
                    {
                        logger.Debug(i.ToString());
                        logger.Debug("Lock time: " + message.SystemProperties.LockedUntilUtc.ToString("yyyy-MM-dd hh:mm:ss"));
                        logger.Debug("Lock token info: " + message.SystemProperties.IsLockTokenSet);
                        logger.Debug("Lock token: " + message.SystemProperties.LockToken);
                        Thread.Sleep(60000);
                    }
                    logger.Debug("Processing completed.");
                    await client.CompleteAsync(message.SystemProperties.LockToken);
                }
                catch (Exception ex)
                {
                    logger.Error(ex.Message);
                    logger.Error(ex.StackTrace);
                    await client.DeadLetterAsync(message.SystemProperties.LockToken);
                }
            }, new MessageHandlerOptions(LogMessageHandlerException)
            {
                AutoComplete = false,
                MaxAutoRenewDuration = TimeSpan.FromMinutes(120)
            });

log

Answer 1

Lock renewal is not a guaranteed operation. It's a client-side operation/request which when fails, will not be able to extend the lock. You have to keep that in mind when relying on this feature.