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https://issues.apache.org/jira/browse/KUDU-859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15981782#comment-15981782
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Mike Percy commented on KUDU-859:
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[~tlipcon] I'm not sure how easy exactly, but I think it meets a lot of similar
criteria (low IO overhead, etc) and it probably wouldn't be hard to add it.
> Actively remove data and deltas for deleted columns
> ---------------------------------------------------
>
> Key: KUDU-859
> URL: https://issues.apache.org/jira/browse/KUDU-859
> Project: Kudu
> Issue Type: Improvement
> Components: tablet
> Affects Versions: Private Beta
> Reporter: Todd Lipcon
>
> Currently, we only remove data blocks for deleted columns when we run a
> compaction. If a table is already fully compacted, this won't happen at all.
> In most cases, it will happen very slowly.
> We should add some kind of in-the-background operation which removes the
> CFiles corresponding to deleted columns, and modify the delta compaction code
> paths to actually drop delta data for deleted columns.
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