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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