PUT

/2017-10-31/functions/{FunctionName}/concurrency

http://lambda.{region}.amazonaws.com/2017-10-31/functions/{FunctionName}/concurrency

Sets the maximum number of simultaneous executions for a function, and reserves capacity for that concurrency level. Concurrency settings apply to the function as a whole, including all published versions and the unpublished version. Reserving concurrency both ensures that your function has capacity to process the specified number of events simultaneously, and prevents it from scaling beyond that level. Use <a>GetFunction</a> to see the current setting for a function. Use <a>GetAccountSettings</a> to see your Regional concurrency limit. You can reserve concurrency for as many functions as you like, as long as you leave at least 100 simultaneous executions unreserved for functions that aren't configured with a per-function limit. For more information, see <a href="https://docs.aws.amazon.com/lambda/latest/dg/invocation-scaling.html">Lambda function scaling</a>.

Access Token Required: API Key

Path Parameters

FunctionNamestringrequired

The name of the Lambda function. Name formats <ul> <li> Function name – <code>my-function</code>. </li> <li> Function ARN – <code>arn:aws:lambda:us-west-2:123456789012:function:my-function</code>. </li> <li> Partial ARN – <code>123456789012:function:my-function</code>. </li> </ul> The length constraint applies only to the full ARN. If you specify only the function name, it is limited to 64 characters in length.

Body Params

ReservedConcurrentExecutionsintegerrequired

The number of simultaneous executions to reserve for the function.

Responses

{
  "success": true,
  "data": {
    "id": "abc123",
    "created_at": "2025-01-01T00:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters"
  }
}

Language

CredentialsAPI KEY

API Key

Enter token below to save for later

cURL Request

1curl --request PUT \
2     --url 'http://lambda.{region}.amazonaws.com/2017-10-31/functions/{FunctionName}/concurrency' \
3     --header 'accept: application/json' \
4     --header 'content-type: application/json'

Response

1{
2  "success": true,
3  "data": {
4    "id": "abc123",
5    "created_at": "2025-01-01T00:00:00Z"
6  }
7}

PUT