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https://issues.apache.org/jira/browse/HBASE-12161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14173627#comment-14173627
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Matteo Bertozzi commented on HBASE-12161:
-----------------------------------------

I was testing the patch before committing it, but sometimes fails with:
{noformat}
testAccessControlClientGrantRevokeOnNamespace(org.apache.hadoop.hbase.security.access.TestAccessController)
  Time elapsed: 1.544 sec  <<< FAILURE!
java.lang.AssertionError: Expected action to pass for user 'testNS' but was 
denied
  at org.junit.Assert.fail(Assert.java:88)
  at 
org.apache.hadoop.hbase.security.access.SecureTestUtil.verifyAllowed(SecureTestUtil.java:158)
  at 
org.apache.hadoop.hbase.security.access.SecureTestUtil.verifyAllowed(SecureTestUtil.java:165)
  at 
org.apache.hadoop.hbase.security.access.TestAccessController.testAccessControlClientGrantRevokeOnNamespace(TestAccessController.java:2135)
{noformat}

the problem is that the grant/revoke was not applied yet. a simple 
Thread.sleep() minimize the problem, but maybe you can add a better check 

> Add support for grant/revoke on namespaces in AccessControlClient
> -----------------------------------------------------------------
>
>                 Key: HBASE-12161
>                 URL: https://issues.apache.org/jira/browse/HBASE-12161
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Srikanth Srungarapu
>            Assignee: Srikanth Srungarapu
>            Priority: Minor
>             Fix For: 2.0.0, 0.98.8, 0.99.2
>
>         Attachments: HBASE-12161_0.98.patch, HBASE-12161_master.patch, 
> HBASE-12161_master_v2.patch, HBASE-12161_v3.patch
>
>
> As per the description.



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