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https://issues.apache.org/jira/browse/HBASE-19254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16251211#comment-16251211
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Anoop Sam John commented on HBASE-19254:
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+1 on [~chia7712] suggestion.
> Write up how InterfaceAudience works over class hierarchy
> ---------------------------------------------------------
>
> Key: HBASE-19254
> URL: https://issues.apache.org/jira/browse/HBASE-19254
> Project: HBase
> Issue Type: Task
> Components: documentation
> Reporter: stack
>
> Over on the tail of HBASE-19235, there is a discussion around marking classes
> with InterfaceAudicence in a hierarchy. One camp suggests that it could be
> possible that a super class might be IA.Private but subclasses (and their
> methods) could then be IA.LP. General opinion held the opposite. [~chia7712]
> said it best:
> bq. It makes sense to me that sub-class can always narrow the declaration
> (ex. IA.Public -> IA.Private/IA.LP). Widening the declaration is like a issue
> we need to fix.....
> This issue is about adding a note to the IA section in refguide (should
> probably pass it by dev list before it goes into refguide).
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