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From "Jean-Marc Spaggiari (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10115) Add a hook for compaction deletes
Date Wed, 11 Dec 2013 21:09:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13845724#comment-13845724
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Jean-Marc Spaggiari commented on HBASE-10115:
---------------------------------------------

Hi [~apurtell], how will you build a schema for that?

Like, let's take this usecase.

User push data into HBase with versions=10. And want to make sure data after 10 versions is
not lost. They can of course run MR jobs, count the versions, and make sure that version 10
is stored somewhere else in case a new version is coming and pushing it out, but will be a
pain. Why can't they just hook on this deletion to do what they want with the version which
is going to be purged? I'm not sure how a schema option can help with that.

> Add a hook for compaction deletes
> ---------------------------------
>
>                 Key: HBASE-10115
>                 URL: https://issues.apache.org/jira/browse/HBASE-10115
>             Project: HBase
>          Issue Type: Bug
>          Components: Compaction, Coprocessors
>    Affects Versions: 0.99.0
>            Reporter: Jean-Marc Spaggiari
>            Priority: Minor
>
> The idea is to add a hook to coprocessors to be able to get triggered when compaction
delete a cell before of the number of versions or the TTL.



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