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https://issues.apache.org/jira/browse/HBASE-19092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16251222#comment-16251222
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Anoop Sam John commented on HBASE-19092:
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bq.{@link PrivateCellUtil#MAX_TAGS_LENGTH} define, in PCU and not in Tag?
This is the length of all tags. So Tag may be not the apt place. If we have 
moved methods for extracting tag(s) from a Cell within ExtendedCell, ya we can 
see whether we can keep it in ExtendedCell.
bq.Can TagType be a subclass of Tag?
I dont think TagType is-a tag.  This is just a constants class for keeping the 
system tags types.


> Make Tag IA.LimitedPrivate and expose for CPs
> ---------------------------------------------
>
>                 Key: HBASE-19092
>                 URL: https://issues.apache.org/jira/browse/HBASE-19092
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Coprocessors
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Critical
>             Fix For: 2.0.0-beta-1
>
>         Attachments: HBASE-19092-branch-2.patch, 
> HBASE-19092-branch-2_5.patch, HBASE-19092-branch-2_5.patch, 
> HBASE-19092_001-branch-2.patch
>
>
> We need to make tags as LimitedPrivate as some use cases are trying to use 
> tags like timeline server. The same topic was discussed in dev@ and also in 
> HBASE-18995.
> Shall we target this for beta1 - cc [~saint....@gmail.com].
> So once we do this all related Util methods and APIs should also move to 
> LimitedPrivate Util classes.



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