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https://issues.apache.org/jira/browse/HBASE-18948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16193800#comment-16193800
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Josh Elser commented on HBASE-18948:
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bq. But coprocessors can currently access and set cell Tags. So then the 
proposed patch is not accurate.

bq. Edit: I know the security coprocessors defend against the possibility of 
user submission of faked security cell tag by stripping them out. Or, I 
remember writing that code. Again the current state of the code should be 
reviewed.

Please see the discussion already on this issue that recommended that the code 
must be reviewed to ensure that all CP paths are accurate. There is ambiguity 
around this area.

> HBase tags are server side only.
> --------------------------------
>
>                 Key: HBASE-18948
>                 URL: https://issues.apache.org/jira/browse/HBASE-18948
>             Project: HBase
>          Issue Type: Improvement
>          Components: documentation
>            Reporter: Thiriguna Bharat Rao
>            Assignee: Thiriguna Bharat Rao
>            Priority: Minor
>             Fix For: 3.0.0
>
>         Attachments: HBASE-18948.patch
>
>
> HBase tags are server side only. In the Apache HBase documentation, in 
> section 62.1.1 http://hbase.apache.org/book.html#_implementation_details , I 
> am going to add a sentence to state explicitly that "Tags are not available 
> for get/set from client operations including coprocessors". 



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