[jira] [Commented] (KUDU-859) Actively remove data and deltas for deleted columns

["Mike Percy (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KUDU-859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15981782#comment-15981782 ] 

Mike Percy commented on KUDU-859:
---------------------------------

[~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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