Andrii Babiichuk created AMBARI-18626:

             Summary: UI doesn't show validation errors for removed properties
                 Key: AMBARI-18626
             Project: Ambari
          Issue Type: Bug
          Components: ambari-web
    Affects Versions: 2.5.0
            Reporter: Andrii Babiichuk
            Assignee: Andrii Babiichuk
             Fix For: 3.0.0

Validation errors where added for empty or removed hadoop.proxyuser.* 
properties. But if a property doesn't exist, UI doesn't show a validation 
warning item (stack_advisor returns an error in validation items).

1) Start install wizard
2) Select HDFS, Yarn, Zookeeper
3) Navigate to Customize Service page
4) Select HDFS and open *Custom core-site* category
5) Remove any/all hadoop.proxyuser.* properties , e.g. 
6) Click next

No warnings.

The warning: "Value should be set for hadoop.proxyuser.hdfs.groups"

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