Suspend and reactivate messaging entities (disable)

Queues, topics, and subscriptions can be temporarily suspended. Suspension puts the entity into a disabled state in which all messages are maintained in storage. However, messages cannot be removed or added, and the respective protocol operations yield errors.

You may want to suspend an entity for urgent administrative reasons. For example, a faulty receiver takes messages off the queue, fails processing, and yet incorrectly completes the messages and removes them. In this case, you may want to disable the queue for receives until you correct and deploy the code.

A suspension or reactivation can be performed either by the user or by the system. The system only suspends entities because of grave administrative reasons such as hitting the subscription spending limit. System-disabled entities cannot be reactivated by the user, but are restored when the cause of the suspension has been addressed.

Queue status

The states that can be set for a queue are:

  • Active: The queue is active. You can send messages to and receive messages from the queue.
  • Disabled: The queue is suspended. It's equivalent to setting both SendDisabled and ReceiveDisabled.
  • SendDisabled: You can't send messages to the queue, but you can receive messages from it. You'll get an exception if you try to send messages to the queue.
  • ReceiveDisabled: You can send messages to the queue, but you can't receive messages from it. You'll get an exception if you try to receive messages to the queue.

Change the queue status in the Azure portal:

  1. In the Azure portal, navigate to your Service Bus namespace.

  2. Select the queue for which you want to change the status. You see queues in the bottom pane in the middle.

  3. On the Service Bus Queue page, see the current status of the queue as a hyperlink. If the Overview isn't selected on the left menu, select it to see the status of the queue. Select the current status of the queue to change it.

    Select state of the queue

  4. Select the new status for the queue, and select OK.

    Set state of the queue

You can also disable the send and receive operations using the Service Bus NamespaceManager APIs in the .NET SDK, or using an Azure Resource Manager template through Azure CLI or Azure PowerShell.

Change the queue status using Azure PowerShell

The PowerShell command to disable a queue is shown in the following example. The reactivation command is equivalent, setting Status to Active.

$q = Get-AzServiceBusQueue -ResourceGroup mygrp -NamespaceName myns -QueueName myqueue

$q.Status = "Disabled"

Set-AzServiceBusQueue -ResourceGroup mygrp -NamespaceName myns -QueueName myqueue -QueueObj $q

Topic status

You can change topic status in the Azure portal. Select the current status of the topic to see the following page, which allows you to change the status.

Change topic status

The states that can be set for a topic are:

  • Active: The topic is active. You can send messages to the topic.
  • Disabled: The topic is suspended. You can't send messages to the topic.
  • SendDisabled: Same effect as Disabled. You can't send messages to the topic. You'll get an exception if you try to send messages to the topic.

Subscription status

You can change subscription status in the Azure portal. Select the current status of the subscription to see the following page, which allows you to change the status.

Change subscription status

The states that can be set for a subscription are:

  • Active: The subscription is active. You can receive messages frm the subscription.
  • Disabled: The subscription is suspended. You can't receive messages from the subscription.
  • ReceiveDisabled: Same effect as Disabled. You can't receive messages from the subscription. You'll get an exception if you try to receive messages to the subscription.
Topic status Subscription status Behavior
Active Active You can send messages to the topic and receive messages from the subscription.
Active Disabled or Receive Disabled You can send messages to the topic, but you can't receive messages from the subscription
Disabled or Send Disabled Active You can't send messages to the topic, but you can receive messages that are already at the subscription.
Disabled or Send Disabled Disabled or Receive Disabled You can't send messages to the topic and you can't receive from the subscription either.

Other statuses

The EntityStatus enumeration also defines a set of transitional states that can only be set by the system.

Next steps

To learn more about Service Bus messaging, see the following topics: