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https://issues.apache.org/jira/browse/HBASE-19535?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-19535:
--------------------------
    Fix Version/s:     (was: 2.0.0)
                   3.0.0

> Introduce a new annotation to say there is no BC guarantee in the inheritance
> -----------------------------------------------------------------------------
>
>                 Key: HBASE-19535
>                 URL: https://issues.apache.org/jira/browse/HBASE-19535
>             Project: HBase
>          Issue Type: Task
>            Reporter: Chia-Ping Tsai
>            Priority: Critical
>             Fix For: 3.0.0
>
>
> We have added many Public "read-only" interface in 2.0 to save user from the 
> dangerous operations. For example, TableDescriptor, ColumnFamilyDescriptor, 
> Region, Store, etc. However, this change make us be hard to enhance these 
> interface (ie. add the new APIs)  because the BC will be broken for the user 
> having the subclass of these interfaces. In contrast with Cell, Filter, and 
> coprocessor, these new interfaces are NOT designed to be a extendable class 
> for user but we have no explicit  caveat. As I see it, it is necessary to 
> introduce an new annotation to explicitly say "you CAN extend this Public 
> class with the BC guarantee". On the other hand, user should not extend the 
> Public classes which don't have the such annotation.



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