Topic. In contrast to the Queues, Topics may contain multiple Subscriptions, each Subscription resembles a Queue. So, the same message can be received from different Subscriptions of a Topic. Based on predefined Rules, the messages can be sent to different Subscriptions.
Azure Service Bus is used as a messaging service in many enterprises. Service Bus contains two types of messaging entities: Queues and Topics.
Queues transmit the messages in FIFO (First In, First Out) message delivery. Each message in a Queue can be received by only one active receiver.
In contrast to the Queues, Topics may contain multiple Subscriptions, each Subscription resembles a Queue. So, the same message can be received from different Subscriptions of a Topic. Based on predefined Rules, the messages can be sent to different Subscriptions.
Service Bus Queues and Topic Subscriptions provide a secondary Sub-Queue, called a Dead-letter Queue (DLQ). This Dead-letter Sub-Queue is created at the time of entity creation. Dead-letter Queue holds the messages, which have any problem in processing. The messages in Dead-letter Queue can be removed by receiving them. There are certain reasons, why the messages move to Dead-letter Queue. They are:
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