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https://issues.apache.org/jira/browse/HBASE-7910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14068027#comment-14068027
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Andrew Purtell commented on HBASE-7910:
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bq. On the other hand there are no visible problems (I know of) that stem from 
this - other than ugly unnecessary cod

Yes, there are performance concerns when security is active, see HBASE-11444

> Dont use reflection for security
> --------------------------------
>
>                 Key: HBASE-7910
>                 URL: https://issues.apache.org/jira/browse/HBASE-7910
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Enis Soztutar
>            Assignee: Mike Drob
>              Labels: noob
>         Attachments: HBASE-7910-0.94.patch, HBASE-7910.patch.txt
>
>
> security.User class uses reflection so that HBase can work with older 
> Hadoop's not having security. Now that we require 1.x, or 0.23 or 2.x, all 
> Hadoop versions have security code. We can get rid of most of the User class. 



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