[jira] [Created] (YARN-9419) Log a warning if GPU isolation is enabled but LinuxContainerExecutor is disabled

["Szilard Nemeth (JIRA)" <ji...@apache.org>]

Szilard Nemeth created YARN-9419:
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             Summary: 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


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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