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From "Lars Hofhansl (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4536) Allow CF to retain deleted rows
Date Mon, 03 Oct 2011 23:12:33 GMT
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: 0.92.0, 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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