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https://issues.apache.org/jira/browse/HBASE-4536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121762#comment-13121762
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Lars Hofhansl commented on HBASE-4536:
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That might be getting hard to understand. minVersions would have slightly
different meaning depending on whether that extra flag is set. Without the flag
minVersions is like "maxVersions for deleted rows", not sure who would need
that.
Having just the flag for deleted rows would also make the code easier to follow
as the column tracker would no longer need to distinguish between "normal"
rows, delete markers, and deleted rows as it does in the current patch; but
only between rows (deleted or not) and delete markers.
> 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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