Set cpu and memory requirements for a Fargate AWS Batch job from an AWS Cloudwatch event

Question

I am trying to automate Fargate AWS Batch jobs by means of AWS Cloudwatch Events. So far, so good. I am trying to run the same job definition with different configurations. I am able to set the batch job as a cloudwatch event target. I have learned how to use the Constant (JSON text) configuration to set a parameter of the job. Thus, I can set the name parameter successfully and the job runs. However, I am not able to also set the memory and cpu settings in the Cloudwatch event. I would like to use a larger machine for a a bigger port such as Singapore, without changing the job definition. After all, at the moment it still uses the default vpcu and memory settings of the job definition.

```
{ 
	"Parameters": {"name":"wilhelmshaven"},  
	"ContainerOverrides": {
		"Command": ["upload_to_day.py", "-port_name","Ref::name"], 	
        "resourceRequirements": [ 
			{"type": "MEMORY", "value": "4096"},
			{"type": "VCPU", "value": "2"}
		] 
	}
}
```
Does any one know how to set the Constant (JSON text) configuration or input transformer correctly?

Edit: If I try the same thing using the AWS CLI, I can achieve what I would like to do.
```
aws batch submit-job \
        --job-name "run-wilhelmshaven" \
        --job-queue "arn:aws:batch:eu-central-1:123666072061:job-queue/upload-raw-to-day-vtexplorer" \
        --job-definition "arn:aws:batch:eu-central-1:123666072061:job-definition/upload-to-day:2" \
        --container-overrides '{"command": ["upload_to_day.py", "-port_name","wilhelmshaven"], "resourceRequirements": [{"value": "2", "type": "VCPU"}, {"value": "4096", "type": "MEMORY"}]}'
```

Answer

The names of the keys in `ContainerOverrides` need to be capitalized. This is documented:
[AWS Batch Jobs as EventBridge Targets - AWS Batch](https://docs.aws.amazon.com/batch/latest/userguide/batch-cwe-target.html)

> Note
> 
> The names of the members of the [ContainerOverrides](https://docs.aws.amazon.com/batch/latest/APIReference/API_ContainerOverrides.html) structure must be capitalized. For example, `Command` and `ResourceRequirements` instead of `command` and `resourceRequirements`.

Try this JSON:
```
{
 "Parameters": {"name": "wilhelmshaven"},
 "ContainerOverrides": {
  "Command": [
   "upload_to_day.py",
   "-port_name",
   "Ref::name"
  ],
  "ResourceRequirements": [
   {
    "Type": "MEMORY",
    "Value": "4096"
   },
   {
    "Type": "VCPU",
    "Value": "2"
   }
  ]
 }
}
```
Thanks,

Lee Hart
AWS Documentation

Set cpu and memory requirements for a Fargate AWS Batch job from an AWS Cloudwatch event

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