Yan Xu updated MESOS-6219:
    Summary: Improve auto-detection of predefined resource types.  (was: 
Improve auto-detection of built-in resources)

> Improve auto-detection of predefined resource types.
> ----------------------------------------------------
>                 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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