Siddharth Ahuja created YARN-10699:
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             Summary: Document the fact that usage of usernames/groupnames with 
a "." (dot) is strictly not recommended
                 Key: YARN-10699
                 URL: https://issues.apache.org/jira/browse/YARN-10699
             Project: Hadoop YARN
          Issue Type: Improvement
          Components: docs, documentation
            Reporter: Siddharth Ahuja


Based on discussions in YARN-10652, it is clear that usage of a "." (dot) in a 
username/groupname (e.g. users in AD/LDAP) can cause unexpected issues e.g. 
[placement rules involving username (%user placeholder) will definitely exhibit 
unexpected 
behavior|https://issues.apache.org/jira/browse/YARN-10652?focusedCommentId=17295964&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17295964].

As such, we need to document clearly for our customers that this use-case is 
strictly not recommended in CapacityScheduler.



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