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https://issues.apache.org/jira/browse/HBASE-4071?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack resolved HBASE-4071.
--------------------------
Resolution: Fixed
Fix Version/s: 0.92.0
Release Note: Even if older than TTL, keep N versions; e.g. if N is 1,
we'll purge all versions but the most recent written even if this one version
is older than TTL.
Hadoop Flags: [Reviewed]
Committed to TRUNK. Thanks for sweet feature Lars (Nice reviewing by the other
lads...)
> 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
> Assignee: Lars Hofhansl
> Fix For: 0.92.0
>
> Attachments: MinVersions.diff
>
>
> 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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