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From "Jonathan Gray (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4536) Allow CF to retain deleted rows
Date Thu, 20 Oct 2011 00:07:10 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13131188#comment-13131188
] 

Jonathan Gray commented on HBASE-4536:
--------------------------------------

I'm at +0.5

Add just a bit more high-level, config-level doc somewhere and I'm a strong +1...

:)
                
> Allow CF to retain deleted rows
> -------------------------------
>
>                 Key: HBASE-4536
>                 URL: https://issues.apache.org/jira/browse/HBASE-4536
>             Project: HBase
>          Issue Type: New Feature
>          Components: regionserver
>    Affects Versions: 0.92.0
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.94.0
>
>         Attachments: 4536-v15.txt
>
>
> Parent allows for a cluster to retain rows for a TTL or keep a minimum number of versions.
> However, if a client deletes a row all version older than the delete tomb stone will
be remove at the next major compaction (and even at memstore flush - see HBASE-4241).
> There should be a way to retain those version to guard against software error.
> I see two options here:
> 1. Add a new flag HColumnDescriptor. Something like "RETAIN_DELETED".
> 2. Folds this into the parent change. I.e. keep minimum-number-of-versions of versions
even past the delete marker.
> #1 would allow for more flexibility. #2 comes somewhat naturally with parent (from a
user viewpoint)
> Comments? Any other options?

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