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https://issues.apache.org/jira/browse/HBASE-15368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15174401#comment-15174401
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Dave Latham commented on HBASE-15368:
-------------------------------------
The generalization of windows is nice, but using relative windows like this has
a problem. Date tiered compaction assigns a HFile to a window based on the max
cell timestamp of the data in that HFile. Suppose you have a relative window
of "last 24 hours" with 4 HFiles in it (each with 6 hours of data). If you
compact those files together now you have a single HFile use max timestamp is
up to the present, so none of the cells in any of those files is going to age
to the next window or higher tier. You're going to be much more likely to have
old data hanging around in newer windows. I don't think a relative window is
workable without a major reconsideration of compaction within a window and even
then I wonder if it works any better than fixed windows in practice.
> 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.patch
>
>
> To better determine 'hot' data.
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