Andras Gyori reassigned YARN-9419:

    Assignee: Andras Gyori  (was: Kinga Marton)

> Log a warning if GPU isolation is enabled but LinuxContainerExecutor is 
> disabled
> --------------------------------------------------------------------------------
>                 Key: YARN-9419
>                 URL: https://issues.apache.org/jira/browse/YARN-9419
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Szilard Nemeth
>            Assignee: Andras Gyori
>            Priority: Major
> A WARN log should be added at least (logged once on startup) that notifies 
> the user about a potentially offending configuration: GPU isolation is 
> enabled but LCE is disabled.
> I think this is a dangerous, yet valid configuration: As LCE is the only 
> container executor that utilizes cgroups, no real HW-isolation happens if LCE 
> is disabled. 
> Let's suppose we have 2 GPU devices in 1 node:
>  # NM reports 2 devices (as a Resource) to RM
>  # RM assigns GPU#1 to container#2 that requests 1 GPU device
>  # When container#2 is also requesting 1 GPU device, RM is going to assign 
> either GPU#1 or GPU#2, so there's no guarantee that GPU#2 will be assigned. 
> If GPU#1 is assigned to a second container, nasty things could happen.

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