# Step 4: Simulating an issue and replay events for recovery
<a name="simulate-issue-replay-events-for-recovery"></a>

## Step 1: Enable the simulated issue and send a second API request
<a name="enable-simulated-issue-send-second-api-request"></a>

1. Sign in to the [Amazon Lambda console](https://console.amazonaws.cn/lambda/).

1. On the navigation panel, choose **Functions**.

1. Search for `serverlessrepo-fork-example` and choose `CheckoutFunction`.

1. On the **fork-example-ecommerce-{{my-app}}-CheckoutFunction-{{ABCDEF}}...** page, in the **Environment variables** section, set the **BUG\_ENABLED** variable to **true** and then choose **Save**.

1. Copy the following JSON to a file named `test_event_2.json`.

   ```
   {
   	   "id": 9917,
   	   "date": "2019-03-26T21:11:10-08:00",
   	   "status": "confirmed",
   	   "customer": {
   	      "id": 56999,
   "quantity": 1,
   	      "price": 75.00,
   	      "subtotal": 75.00
   	   }]
   	}
   ```

1. To send an HTTPS request to your API endpoint, pass the sample event payload as input by executing a `curl` command, for example:

   ```
   curl -d "$(cat test_event_2.json)" https://abcdefghij.execute-api.us-east-2.amazonaws.com/Prod/checkout
   ```

   The API returns the following empty response, indicating a successful execution:

   ```
   { }
   ```

## Step 2: Verify simulated data corruption
<a name="verify-simulated-data-corruption"></a>

1. Sign in to the [Amazon DynamoDB console](https://console.amazonaws.cn/dynamodb/).

1. On the navigation panel, choose **Tables**.

1. Search for `serverlessrepo-fork-example` and choose `CheckoutTable`.

1. On the table details page, choose **Items** and then choose the created item.

   The stored attributes are displayed, some marked as **CORRUPTED\!**

## Step 3: Disable the simulated issue
<a name="disable-simulated-issue"></a>

1. Sign in to the [Amazon Lambda console](https://console.amazonaws.cn/lambda/).

1. On the navigation panel, choose **Functions**.

1. Search for `serverlessrepo-fork-example` and choose `CheckoutFunction`.

1. On the **fork-example-ecommerce-{{my-app}}-CheckoutFunction-{{ABCDEF}}...** page, in the **Environment variables** section, set the **BUG\_ENABLED** variable to **false** and then choose **Save**.

## Step 4: Enable replay to recover from the issue
<a name="enable-replay-recover-from-simulated-issue"></a>

1. In the Amazon Lambda console, on the navigation panel, choose **Functions**.

1. Search for `serverlessrepo-fork-example` and choose `ReplayFunction`.

1. Expand the **Designer** section, choose the **SQS** tile and then, in the **SQS** section, choose **Enabled**.
**Note**  
It takes approximately 1 minute for the Amazon SQS event source trigger to become enabled.

1. Choose **Save**.

1. To view the recovered attributes, return to the Amazon DynamoDB console.

1. To disable replay, return to the Amazon Lambda console and disable the Amazon SQS event source trigger for `ReplayFunction`.