[jira] [Commented] (MESOS-6219) Improve auto-detection of predefined resource types.

["Yan Xu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MESOS-6219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15511178#comment-15511178 ] 

Yan Xu commented on MESOS-6219:
-------------------------------

One way to address this may be to have a special resource type:

{code}
message Value {
  enum Type {
    SCALAR = 0;
    RANGES = 1;
    SET = 2;
    TEXT = 3;
+    AUTO = 4;
  }
{code}


- We only do auto-detection for predefined resources and they are identified by names and other fields so the {{type}} is already custom defined. i.e., it doesn't make sense to have {{cpus}} with {{type=RANGES}}. When the parser sees {{type=AUTO}} for {{cpus}}, it auto-detects the value and then assigns the type.
- For custom resources we don't support auto-detection anyways so {{type=AUTO}} would be invalid and the parser would bail.

> 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 predefined resource types 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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