Jason Lowe commented on YARN-3452:

The extra lookups started in 2.6 releases, and it appears to be caused by 
HADOOP-10650.  However YARN really should not be using bogus users on tokens 
anyway in case the RPC layer (or other non-YARN systems) try to do something 
with those users like HADOOP-10650 did.

> 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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