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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4071) Data GC: Remove all versions > TTL EXCEPT the last written version
Date Sun, 14 Aug 2011 06:30:28 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13084792#comment-13084792
] 

Andrew Purtell commented on HBASE-4071:
---------------------------------------

TTLs were introduced to conveniently expire transient data and garbage collect it. Setting
a TTL on a column family defines that column family as transient. Whatever changes are contemplated
to be "hard coded", this use case must be maintained. I want to be able to set a TTL and versions
to 1 or 3 or 10 or whatever and have ALL of the versions discarded when their timestamps indicate
expiry.

> 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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