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https://issues.apache.org/jira/browse/YARN-3452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14993927#comment-14993927
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Allen Wittenauer commented on YARN-3452:
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I wonder what happens when they *do* resolve...
> Bogus token usernames cause many invalid group lookups
> ------------------------------------------------------
>
> Key: YARN-3452
> URL: https://issues.apache.org/jira/browse/YARN-3452
> Project: Hadoop YARN
> Issue Type: Bug
> Components: security
> Reporter: Jason Lowe
>
> YARN uses a number of bogus usernames for tokens, like application attempt
> IDs for NM tokens or even the hardcoded "testing" for the container localizer
> token. These tokens cause the RPC layer to do group lookups on these bogus
> usernames which will never succeed but can take a long time to perform.
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