AWS::Lambda::EventSourceMapping - AWS CloudFormation

AWS::Lambda::EventSourceMapping

The AWS::Lambda::EventSourceMapping resource creates a mapping between an event source and an AWS Lambda function. Lambda reads items from the event source and triggers the function.

For details about each event source type, see the following topics.

Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

JSON

{ "Type" : "AWS::Lambda::EventSourceMapping", "Properties" : { "BatchSize" : Integer, "BisectBatchOnFunctionError" : Boolean, "DestinationConfig" : DestinationConfig, "Enabled" : Boolean, "EventSourceArn" : String, "FunctionName" : String, "MaximumBatchingWindowInSeconds" : Integer, "MaximumRecordAgeInSeconds" : Integer, "MaximumRetryAttempts" : Integer, "ParallelizationFactor" : Integer, "StartingPosition" : String, "Topics" : [ String, ... ] } }

YAML

Type: AWS::Lambda::EventSourceMapping Properties: BatchSize: Integer BisectBatchOnFunctionError: Boolean DestinationConfig: DestinationConfig Enabled: Boolean EventSourceArn: String FunctionName: String MaximumBatchingWindowInSeconds: Integer MaximumRecordAgeInSeconds: Integer MaximumRetryAttempts: Integer ParallelizationFactor: Integer StartingPosition: String Topics: - String

Properties

BatchSize

The maximum number of items to retrieve in a single batch.

  • Amazon Kinesis - Default 100. Max 10,000.

  • Amazon DynamoDB Streams - Default 100. Max 1,000.

  • Amazon Simple Queue Service - Default 10. Max 10.

  • Amazon Managed Streaming for Apache Kafka - Default 100. Max 10,000.

Required: No

Type: Integer

Minimum: 1

Maximum: 10000

Update requires: No interruption

BisectBatchOnFunctionError

(Streams) If the function returns an error, split the batch in two and retry. The default value is false.

Required: No

Type: Boolean

Update requires: No interruption

DestinationConfig

(Streams) An Amazon SQS queue or Amazon SNS topic destination for discarded records.

Required: No

Type: DestinationConfig

Update requires: No interruption

Enabled

If true, the event source mapping is active. Set to false to pause polling and invocation.

Required: No

Type: Boolean

Update requires: No interruption

EventSourceArn

The Amazon Resource Name (ARN) of the event source.

  • Amazon Kinesis - The ARN of the data stream or a stream consumer.

  • Amazon DynamoDB Streams - The ARN of the stream.

  • Amazon Simple Queue Service - The ARN of the queue.

  • Amazon Managed Streaming for Apache Kafka - The ARN of the cluster.

Required: Yes

Type: String

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

Update requires: Replacement

FunctionName

The name of the Lambda function.

Name formats

  • Function name - MyFunction.

  • Function ARN - arn:aws:lambda:us-west-2:123456789012:function:MyFunction.

  • Version or Alias ARN - arn:aws:lambda:us-west-2:123456789012:function:MyFunction:PROD.

  • Partial ARN - 123456789012:function:MyFunction.

The length constraint applies only to the full ARN. If you specify only the function name, it's limited to 64 characters in length.

Required: Yes

Type: String

Minimum: 1

Maximum: 140

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

Update requires: No interruption

MaximumBatchingWindowInSeconds

(Streams) The maximum amount of time to gather records before invoking the function, in seconds.

Required: No

Type: Integer

Minimum: 0

Maximum: 300

Update requires: No interruption

MaximumRecordAgeInSeconds

(Streams) Discard records older than the specified age. The default value is infinite (-1). When set to infinite (-1), failed records are retried until the record expires.

Required: No

Type: Integer

Minimum: 60

Maximum: 604800

Update requires: No interruption

MaximumRetryAttempts

(Streams) Discard records after the specified number of retries. The default value is infinite (-1). When set to infinite (-1), failed records are retried until the record expires.

Required: No

Type: Integer

Minimum: 0

Maximum: 10000

Update requires: No interruption

ParallelizationFactor

(Streams) The number of batches to process from each shard concurrently. The default value is 1.

Required: No

Type: Integer

Minimum: 1

Maximum: 10

Update requires: No interruption

StartingPosition

The position in a stream from which to start reading. Required for Amazon Kinesis, Amazon DynamoDB, and Amazon MSK Streams sources.

  • LATEST - Read only new records.

  • TRIM_HORIZON - Process all available records.

Required: No

Type: String

Update requires: Replacement

Topics

(MSK) The name of the Kafka topic.

Required: No

Type: List of String

Maximum: 1

Update requires: No interruption

Return values

Ref

When you pass the logical ID of this resource to the intrinsic Ref function, Ref returns the mapping's ID.

For more information about using the Ref function, see Ref.

Fn::GetAtt

Id

Not currently supported by AWS CloudFormation.

Examples

Event Source Mapping

Create an event source mapping that reads events from Amazon Kinesis and invokes a Lambda function in the same template.

JSON

"EventSourceMapping": { "Type": "AWS::Lambda::EventSourceMapping", "Properties": { "EventSourceArn": { "Fn::Join": [ "", [ "arn:aws:kinesis:", { "Ref": "AWS::Region" }, ":", { "Ref": "AWS::AccountId" }, ":stream/", { "Ref": "KinesisStream" } ] ] }, "FunctionName": { "Fn::GetAtt": [ "LambdaFunction", "Arn" ] }, "StartingPosition": "TRIM_HORIZON" } }

YAML

MyEventSourceMapping: Type: AWS::Lambda::EventSourceMapping Properties: EventSourceArn: Fn::Join: - "" - - "arn:aws:kinesis:" - Ref: "AWS::Region" - ":" - Ref: "AWS::AccountId" - ":stream/" - Ref: "KinesisStream" FunctionName: Fn::GetAtt: - "LambdaFunction" - "Arn" StartingPosition: "TRIM_HORIZON"