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https://issues.apache.org/jira/browse/YARN-9118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16756544#comment-16756544
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Szilard Nemeth commented on YARN-9118:
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Hi [~pbacsko]!
Thanks for your review comments once again!
When lastDiscoveredGpuInformation.getGpus() is null, the return value of
{{parseGpuDevicesFromAutoDiscoveredGpuInfo()}} will be an empty-list since no
GPU devices are found.
The error is handled elsewhere, see the 2 callers of
{{GpuDiscoverer.getInstance().getGpusUsableByYarn()}}.
Anyway, I added a debug log here as well to indicate that no GPU was found.
Please note that the latest patch contains some additional cleanup, but very
minor ones.
> Handle issues with parsing user defined GPU devices in GpuDiscoverer
> --------------------------------------------------------------------
>
> Key: YARN-9118
> URL: https://issues.apache.org/jira/browse/YARN-9118
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Szilard Nemeth
> Assignee: Szilard Nemeth
> Priority: Major
> Attachments: YARN-9118.001.patch, YARN-9118.002.patch,
> YARN-9118.003.patch, YARN-9118.004.patch
>
>
> getGpusUsableByYarn has the following issues:
> - Duplicate GPU device definitions are not denied: This seems to be the
> biggest issue as it could increase the number of devices on the node if the
> device ID is defined 2 or more times.
> - An empty-string is accepted, it works like the user would not want to use
> auto-discovery and haven't defined any GPU devices: This will result in an
> empty device list, but the empty-string check is never explicitly there in
> the code, so this behavior just coincidental.
> - Number validation does not happen on GPU device IDs (separated by commas)
> Many testcases are added as the coverage was already very low.
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