Yan Xu created MESOS-6219:
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             Summary: Improve auto-detection of built-in resources
                 Key: MESOS-6219
                 URL: https://issues.apache.org/jira/browse/MESOS-6219
             Project: Mesos
          Issue Type: Improvement
          Components: containerization
            Reporter: Yan Xu


Mesos agent currently auto-detects certain standard resources when they are not 
specified. These include cpus, mem, (root) disk, gpus and also MESOS-6062 is 
adding auto-detection for mount disks when the size is specified as a special 
value "0". 

Due to the limitation of the {{Resources}} abstraction the caller of 
{{Resources::parse()}} can't tell if a resource is intentionally specified with 
an empty value or unspecified. The current resource auto-detection in 
{{Containerizer::resources()}} resorts to scanning the {{--resources}} flag to 
check if resource is specified, this is very fragile, e.g., it would think 
{{gpus:0}} is specified (ant not auto-detected) if there is a mount disk with 
its root being {{/biggpush}}.

It would be nice if we can have the user explicitly specify the intention to 
have value of a standard resource auto-detected (at least with the JSON input).



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