Update AWS Athena workgroup using CloudFormation template - amazon-web-services

Question

I have 2 templates those I have taken from the AWS::Athena::WorkGroup - AWS CloudFormation documentation.
The first template athena_create.yaml works as expected. The second template needs to modify the workgroup created in the first template. But I get an error:
MyCustomWorkGroup already exists in stack
arn:aws:cloudformation:us-east-1:XXX:stack/a1/7cc670a0-8d19-11ea-872c-12217e59f19f
Here is the code. create template works correctly.
athena_create.yaml
Resources:
MyAthenaWorkGroup:
Type: AWS::Athena::WorkGroup
Properties:
Name: MyCustomWorkGroup
Description: My WorkGroup
State: ENABLED
Tags:
- Key: "key1"
Value: "value1"
- Key: "key2"
Value: "value2"
WorkGroupConfiguration:
BytesScannedCutoffPerQuery: 200000000
EnforceWorkGroupConfiguration: false
PublishCloudWatchMetricsEnabled: false
RequesterPaysEnabled: true
ResultConfiguration:
OutputLocation: s3://path/to/my/bucket/
athena_update.yaml
Resources:
MyAthenaWorkGroup:
Type: AWS::Athena::WorkGroup
Properties:
Name: MyCustomWorkGroup
Description: My WorkGroup Updated
State: DISABLED
Tags:
- Key: "key1"
Value: "value1"
- Key: "key2"
Value: "value2"
WorkGroupConfigurationUpdates:
BytesScannedCutoffPerQuery: 10000000
EnforceWorkGroupConfiguration: true
PublishCloudWatchMetricsEnabled: true
RequesterPaysEnabled: false
ResultConfigurationUpdates:
EncryptionConfiguration:
EncryptionOption: SSE_S3
OutputLocation: s3://path/to/my/bucket/updated/
The update template mentioned above does not work as expected.

Answer 1

The reason for the error is that the two templates were used to create two independent stacks. This didn't work because they two Athena WorkGroups of same Name: MyCustomWorkGroup.
The correct way to perform create and update the MyCustomWorkGroup is as follows:
Create a stack using athena_create.yaml file.
Once the stack is created, use its Update option to upload athena_update.yaml which is going to update the stack.