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https://issues.apache.org/jira/browse/HBASE-4071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13061107#comment-13061107
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Todd Lipcon commented on HBASE-4071:
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Rather than hard-code these various policies, it would be very nice if the
compaction dropping policy were pluggable. I've often had people request the
ability to do something like check the value of a column, and change TTL based
on that value. Or, given that we have an entire row available when doing a
major compaction, it would be possible to implement a feature like putting an
expiration time as the value of one column, and having it expire the entire
row's worth at that timestamp.
> Data GC: Remove all versions > TTL EXCEPT the last written version
> ------------------------------------------------------------------
>
> Key: HBASE-4071
> URL: https://issues.apache.org/jira/browse/HBASE-4071
> Project: HBase
> Issue Type: New Feature
> Reporter: stack
>
> We were chatting today about our backup cluster. What we want is to be able
> to restore the dataset from any point of time but only within a limited
> timeframe -- say one week. Thereafter, if the versions are older than one
> week, rather than as we do with TTL where we let go of all versions older
> than TTL, instead, let go of all versions EXCEPT the last one written. So,
> its like versions==1 when TTL > one week. We want to allow that if an error
> is caught within a week of its happening -- user mistakenly removes a
> critical table -- then we'll be able to restore up the the moment just before
> catastrophe hit otherwise, we keep one version only.
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