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https://issues.apache.org/jira/browse/HBASE-12859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14294013#comment-14294013
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Enis Soztutar commented on HBASE-12859:
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We do not differentiate or explicitly document this, but my understanding of 
most of our InterfaceAudience.Public is for consumption, not for extending or 
implementing interfaces (except for some coprocessor cases). So I think we 
should be free to add new methods in Admin, Connection, etc in minor versions. 
I would say that in patch versions we should not do such changes. 

Maybe we can do a base classes as a convenience, but still with no guarantees. 

> Major compaction completion tracker
> -----------------------------------
>
>                 Key: HBASE-12859
>                 URL: https://issues.apache.org/jira/browse/HBASE-12859
>             Project: HBase
>          Issue Type: Brainstorming
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>         Attachments: 12859-v1.txt, 12859-v2.txt, 12859-v3.txt, 12859-v4.txt, 
> 12859-v5.txt, 12859-wip-UNFINISHED.txt
>
>
> In various scenarios it is helpful to know a guaranteed timestamp up to which 
> all data in a table was major compacted.
> We can do that keeping a major compaction timestamp in META.
> A client then can iterate all region of a table and find a definite 
> timestamp, which is the oldest compaction timestamp of any of the regions.
> [~apurtell], [~ghelmling], [~giacomotaylor].



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