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That also the reason Service Bus have D ead L ettering Q ueue to prevent Service Bus message being lost. As mentioned before this “Lock expired” exception may be due to many reasons.We recommend using Asynchronous over than Synchronous. From the test result, it indicates that Asynchronous Messaging pattern is more efficient since it will return immediately.Asynchronous programming in C# | Microsoft Docs You can get detailed information on how the asynchronous C# backend works from this document. īut using Synchronous pattern, all the Messages was completed one by one, the waiting time exceeds 30s. And then complete messages in Asynchronous pattern, Messages can be completed without blocking. Using Peeklock receive mode, Service Bus locked all the 5 000 messages at the same time. This exception is highly possible in receiving messages in one operation. Why didn’t we get any errors while using the Async pattern in this program? Why we got “Lock expired” exception while using Sync pattern ? But after a while It shows error for “lock expired ”. At first time the messages can also finish in 200ms to 300ms. ToUnixTimeMilliseconds () Ĭonsole.WriteLine ( "Receiving message -, timestamp:", Timestamp3, ex.Message ) Var Timestamp2 = new DateTimeOffset ( DateTime.UtcNow ). QueueClient receiveClient = QueueClient.CreateFromConnectionString ( connectionString, queueName ) Here is the program that complete messages in Asynchronous patterns.To simulate the situation by sending a large number of messages, I received 5 00 0 messages at one operation. All the functions have “ Async ” like ReceiveBatchAsync means the functions are working Asynchronous ly. Here I use different function in .Net for receive messages. If you are interested about the usage of “Max delivery count” please check from here Service Bus exceeding MaxDeliver圜ount. This blog will also reproduce this Lock expired exception for Receive Messages Asynchronous ly and Synchronous ly. It may be due to many reasons like Receive Application has high latency. This exception is because t he message transaction time longer than Lock duration. There is a common exception for the Service Bus Lock expiration. Then, return the message to the application.Locks it to prevent other consumers from receiving it.Every time the Service Bus f inds the next message to be consumed.
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The principle for PeekLock Receive mode is that: Here is more background information about the principle for PeekLock receive mode. This test is archived based on Service B us PeekLock Receive mode. Applications typically use asynchronous messaging patterns to enable several communication scenarios. Service Bus asynchronous messaging and Azure Service Bus messaging receive modeįrom the above pre - requisites, we learn the following :Īzure Service Bus support both Asynchronous messaging patterns and Synchronous messaging patterns. However, whether it’s good to Receive Message Asynchronously on the Azure Service Bus?īefore we start, please read these document s. Synchronous operation means the process runs only as a resource or some other process being completed or handed off. These are the definition s we can get from internet.Īsynchronous operation means the process operates independently of other processes.
![bus the process 3 bus the process 3](https://ai2-s2-public.s3.amazonaws.com/figures/2017-08-08/1fe577cdc3881149e9eebea3b1138a4901722f47/2-Figure3-1.png)
As we know there are two kinds of operations for program threads - Asynchronous and S ynchronous.