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https://issues.apache.org/jira/browse/HBASE-15368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15177025#comment-15177025
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Dave Latham commented on HBASE-15368:
-------------------------------------

Agreed, no need for an abstraction unless we expect an alternate 
implementation.  I still think a calendar based alternative would be reasonable 
if anyone wanted it.  Cassandra's DTCS also uses fixed windows, not relative 
ones (see for example the secton "How DTCS works" at  
https://labs.spotify.com/2014/12/18/date-tiered-compaction/ ).

> Add relative window support
> ---------------------------
>
>                 Key: HBASE-15368
>                 URL: https://issues.apache.org/jira/browse/HBASE-15368
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Compaction
>            Reporter: Duo Zhang
>            Assignee: Duo Zhang
>         Attachments: HBASE-15368-v1.patch, HBASE-15368.patch
>
>
> To better determine 'hot' data.



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