AWS Lambda
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Returns configuration information for the specified event source mapping (see CreateEventSourceMapping).

This operation requires permission for the lambda:GetEventSourceMapping action.

Request Syntax

GET /2015-03-31/event-source-mappings/UUID HTTP/1.1

URI Request Parameters

The request requires the following URI parameters.


The AWS Lambda assigned ID of the event source mapping.

Request Body

The request does not have a request body.

Response Syntax

HTTP/1.1 200
Content-type: application/json

   "BatchSize": number,
   "EventSourceArn": "string",
   "FunctionArn": "string",
   "LastModified": number,
   "LastProcessingResult": "string",
   "State": "string",
   "StateTransitionReason": "string",
   "UUID": "string"

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.


The largest number of records that AWS Lambda will retrieve from your event source at the time of invoking your function. Your function receives an event with all the retrieved records.

Type: Integer

Valid Range: Minimum value of 1. Maximum value of 10000.


The Amazon Resource Name (ARN) of the Amazon Kinesis stream that is the source of events.

Type: String

Pattern: arn:aws:([a-zA-Z0-9\-])+:([a-z]{2}-[a-z]+-\d{1})?:(\d{12})?:(.*)


The Lambda function to invoke when AWS Lambda detects an event on the stream.

Type: String

Pattern: arn:aws:lambda:[a-z]{2}-[a-z]+-\d{1}:\d{12}:function:[a-zA-Z0-9-_]+(:(\$LATEST|[a-zA-Z0-9-_]+))?


The UTC time string indicating the last time the event mapping was updated.

Type: Timestamp


The result of the last AWS Lambda invocation of your Lambda function.

Type: String


The state of the event source mapping. It can be Creating, Enabled, Disabled, Enabling, Disabling, Updating, or Deleting.

Type: String


The reason the event source mapping is in its current state. It is either user-requested or an AWS Lambda-initiated state transition.

Type: String


The AWS Lambda assigned opaque identifier for the mapping.

Type: String



One of the parameters in the request is invalid. For example, if you provided an IAM role for AWS Lambda to assume in the CreateFunction or the UpdateFunctionConfiguration API, that AWS Lambda is unable to assume you will get this exception.

HTTP Status Code: 400


The resource (for example, a Lambda function or access policy statement) specified in the request does not exist.

HTTP Status Code: 404


The AWS Lambda service encountered an internal error.

HTTP Status Code: 500


HTTP Status Code: 429

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: