- How To Disable Login Requests On Mac For Scoped Bookmark Agents
- How To Disable Login Requests On Mac For Scoped Bookmark Agent Version
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-->This article describes how Azure Resource Manager throttles requests. It shows you how to track the number of requests that remain before reaching the limit, and how to respond when you've reached the limit.
Throttling happens at two levels. Azure Resource Manager throttles requests for the subscription and tenant. If the request is under the throttling limits for the subscription and tenant, Resource Manager routes the request to the resource provider. The resource provider applies throttling limits that are tailored to its operations. The following image shows how throttling is applied as a request goes from the user to Azure Resource Manager and the resource provider.
Subscription and tenant limits
Every subscription-level and tenant-level operation is subject to throttling limits. Subscription requests are ones that involve passing your subscription ID, such as retrieving the resource groups in your subscription. Tenant requests don't include your subscription ID, such as retrieving valid Azure locations.
The default throttling limits per hour are shown in the following table.
| Scope | Operations | Limit |
|---|---|---|
| Subscription | reads | 12000 |
| Subscription | deletes | 15000 |
| Subscription | writes | 1200 |
| Tenant | reads | 12000 |
| Tenant | writes | 1200 |
These limits are scoped to the security principal (user or application) making the requests and the subscription ID or tenant ID. If your requests come from more than one security principal, your limit across the subscription or tenant is greater than 12,000 and 1,200 per hour.
These limits apply to each Azure Resource Manager instance. There are multiple instances in every Azure region, and Azure Resource Manager is deployed to all Azure regions. So, in practice, the limits are higher than these limits. The requests from a user are usually handled by different instances of Azure Resource Manager.
Resource provider limits
Resource providers apply their own throttling limits. Because Resource Manager throttles by principal ID and by instance of Resource Manager, the resource provider might receive more requests than the default limits in the previous section.
This section discusses the throttling limits of some widely used resource providers.
Storage throttling
The following limits apply only when you perform management operations by using Azure Resource Manager with Azure Storage.
| Resource | Limit |
|---|---|
| Storage account management operations (read) | 800 per 5 minutes |
| Storage account management operations (write) | 10 per second / 1200 per hour |
| Storage account management operations (list) | 100 per 5 minutes |
Network throttling
The Microsoft.Network resource provider applies the following throttle limits:
| Operation | Limit |
|---|---|
| write / delete (PUT) | 1000 per 5 minutes |
| read (GET) | 10000 per 5 minutes |
Compute throttling
For information about throttling limits for compute operations, see Troubleshooting API throttling errors - Compute.
For checking virtual machine instances within a virtual machine scale set, use the Virtual Machine Scale Sets operations. For example, use the Virtual Machine Scale Set VMs - List with parameters to check the power state of virtual machine instances. This API reduces the number of requests.
Azure Resource Graph throttling
Azure Resource Graph limits the number of requests to its operations. The steps in this article to determine the remaining requests and how to respond when the limit is reached also apply to Resource Graph. However, Resource Graph sets its own limit and reset rate. For more information, see Resource Graph throttling headers.
Other resource providers
For information about throttling in other resource providers, see:
Error code
When you reach the limit, you receive the HTTP status code 429 Too many requests. The response includes a Retry-After value, which specifies the number of seconds your application should wait (or sleep) before sending the next request. If you send a request before the retry value has elapsed, your request isn't processed and a new retry value is returned.
After waiting for specified time, you can also close and reopen your connection to Azure. By resetting the connection, you may connect to a different instance of Azure Resource Manager.
If you're using an Azure SDK, the SDK may have an auto retry configuration. For more information, see Retry guidance for Azure services.
Some resource providers return 429 to report a temporary problem. The problem could be an overload condition that isn't directly caused by your request. Or, it could represent a temporary error about the state of the target resource or dependent resource. For example, the network resource provider returns 429 with the RetryableErrorDueToAnotherOperation error code when the target resource is locked by another operation. To determine if the error comes from throttling or a temporary condition, view the error details in the response.
Remaining requests
You can determine the number of remaining requests by examining response headers. Read requests return a value in the header for the number of remaining read requests. Write requests include a value for the number of remaining write requests. The following table describes the response headers you can examine for those values:
| Response header | Description |
|---|---|
| x-ms-ratelimit-remaining-subscription-reads | Subscription scoped reads remaining. This value is returned on read operations. |
| x-ms-ratelimit-remaining-subscription-writes | Subscription scoped writes remaining. This value is returned on write operations. |
| x-ms-ratelimit-remaining-tenant-reads | Tenant scoped reads remaining |
| x-ms-ratelimit-remaining-tenant-writes | Tenant scoped writes remaining |
| x-ms-ratelimit-remaining-subscription-resource-requests | Subscription scoped resource type requests remaining. This header value is only returned if a service has overridden the default limit. Resource Manager adds this value instead of the subscription reads or writes. |
| x-ms-ratelimit-remaining-subscription-resource-entities-read | Subscription scoped resource type collection requests remaining. This header value is only returned if a service has overridden the default limit. This value provides the number of remaining collection requests (list resources). |
| x-ms-ratelimit-remaining-tenant-resource-requests | Tenant scoped resource type requests remaining. This header is only added for requests at tenant level, and only if a service has overridden the default limit. Resource Manager adds this value instead of the tenant reads or writes. |
| x-ms-ratelimit-remaining-tenant-resource-entities-read | Tenant scoped resource type collection requests remaining. This header is only added for requests at tenant level, and only if a service has overridden the default limit. |
The resource provider can also return response headers with information about remaining requests. For information about response headers returned by the Compute resource provider, see Call rate informational response headers.
How To Disable Login Requests On Mac For Scoped Bookmark Agents
Retrieving the header values
How To Disable Login Requests On Mac For Scoped Bookmark Agent Version
Retrieving these header values in your code or script is no different than retrieving any header value.
For example, in C#, you retrieve the header value from an HttpWebResponse object named response with the following code:
In PowerShell, you retrieve the header value from an Invoke-WebRequest operation.
For a complete PowerShell example, see Check Resource Manager Limits for a Subscription.
If you want to see the remaining requests for debugging, you can provide the -Debug parameter on your PowerShell cmdlet.
Which returns many values, including the following response value:
To get write limits, use a write operation:
Which returns many values, including the following values:
In Azure CLI, you retrieve the header value by using the more verbose option.
Which returns many values, including the following values:
To get write limits, use a write operation:
Which returns many values, including the following values:
Next steps
- For a complete PowerShell example, see Check Resource Manager Limits for a Subscription.
- For more information about limits and quotas, see Azure subscription and service limits, quotas, and constraints.
- To learn about handling asynchronous REST requests, see Track asynchronous Azure operations.
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