[
https://issues.apache.org/jira/browse/YARN-3452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14483861#comment-14483861
]
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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
