Data GC: Remove all versions > TTL EXCEPT the last written version
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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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