System.UnexpectedException: Metadata.Operations.enqueueDeployment: Salesforce System Error: 1393463776-817 (799279837) (799279837)

Question

I have some code which updates a Custom Metadata setting, something like this:

public void clearValue() {
    Metadata.CustomMetadata customMetadata = createCustomMetadata();
    customMetadata.values.add(createCustomMetadataValue('namespace__Fieldname__c', ''));
    deployMetadata(customMetadata);
}

It works fine.

But when it's called after a scheduled job is aborted:

System.abortJob(jobId);

I am getting this error:

System.UnexpectedException:
Metadata.Operations.enqueueDeployment:
Salesforce System Error: 1393463776-817 (799279837) (799279837)

I cannot find anything online about this.

I am able to work around it by calling System.abortJob from a @future method:

@future
private static void abortJobAsync(Id jobId) {
    System.abortJob(jobId);
}

But then I am unable to ensure all the intended actions completed successfully within the same transaction and report back the user accordingly.

1. Is this the expected behaviour?
2. Why is this happening?
3. Is there a better solution?

Answer 1

In the end, I got around this error by doing the Metadata.Operations.enqueueDeployment before calling System.abortJob(jobId); rather than the other way around as before. No need for an @future