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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4071) Data GC: Remove all versions > TTL EXCEPT the last written version
Date Thu, 07 Jul 2011 07:51:16 GMT

    [ 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:
------------------------------------

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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