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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4536) Allow CF to retain deleted rows
Date Sat, 08 Oct 2011 04:19:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123368#comment-13123368
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Lars Hofhansl commented on HBASE-4536:
--------------------------------------

Yet another option is to take the smallest time of any of the store files and remove the family
markers if they are older than that. The marker may survive two compactions in that case,
but eventually they'll be removed.

In addition to address Jon's need, I think we can add a raw flag to the Scan object. If true,
the scan will retrieve all available rows including deleted rows and delete markers. With
the rest of the changes from this patch, that would be really easy to do.
(I assume I'd have to increment the SCAN_VERSION, correct?)

                
> Allow CF to retain deleted rows
> -------------------------------
>
>                 Key: HBASE-4536
>                 URL: https://issues.apache.org/jira/browse/HBASE-4536
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver
>    Affects Versions: 0.92.0
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>             Fix For: 0.94.0
>
>
> 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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