+++
title = "Step 5 - Map the source stream to the Lambda function "
date = 2019-12-02T12:34:07-08:00
weight = 5
+++

So far, you have the source table with DynamoDB Streams enabled and the Lambda function. Now you need to map the source stream to the Lambda function.
You need to copy the ARN from the previous step and paste it into the following command before running the command.

```bash
aws lambda create-event-source-mapping \
--function-name ddbreplica_lambda --enabled --batch-size 100 --starting-position TRIM_HORIZON \
--event-source-arn YOUR_STREAM_ARN_HERE
```

{{% notice info %}}
You must copy the full stream label ARN, including the timestamp on the end
{{% /notice %}}

{{%expand "Click here for an example" %}}

```bash
aws lambda create-event-source-mapping \
--function-name ddbreplica_lambda --enabled --batch-size 100 --starting-position TRIM_HORIZON \
--event-source-arn arn:aws:dynamodb:<REGION>:<ACCOUNTID>:table/logfile/stream/2021-12-31T00:00:00.000
```

{{% /expand%}}

The following is the expected result.

```json
{
  "UUID": "0dcede66-709c-4073-a628-724d01b92095",
  "BatchSize": 100,
  "MaximumBatchingWindowInSeconds": 0,
  "ParallelizationFactor": 1,
  "EventSourceArn": "arn:aws:dynamodb:<REGION>:<ACCOUNTID>:table/logfile/stream/2021-12-31T00:00:00.000",
  "FunctionArn": "arn:aws:lambda:<REGION>:<ACCOUNTID>:function:ddbreplica_lambda",
  "LastModified": 1663286115.972,
  "LastProcessingResult": "No records processed",
  "State": "Creating",
  "StateTransitionReason": "User action",
  "DestinationConfig": {
    "OnFailure": {}
  },
  "MaximumRecordAgeInSeconds": -1,
  "BisectBatchOnFunctionError": false,
  "MaximumRetryAttempts": -1
}
```