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https://issues.apache.org/jira/browse/CASSANDRA-7272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14249984#comment-14249984
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Marcus Eriksson commented on CASSANDRA-7272:
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patch is here, needs rebase so not setting patch available yet
https://github.com/krummas/cassandra/commits/marcuse/7019-2
> Add "Major" Compaction to LCS
> ------------------------------
>
> Key: CASSANDRA-7272
> URL: https://issues.apache.org/jira/browse/CASSANDRA-7272
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: T Jake Luciani
> Priority: Minor
> Labels: compaction
> Fix For: 3.0
>
>
> LCS has a number of minor issues (maybe major depending on your perspective).
> LCS is primarily used for wide rows so for instance when you repair data in
> LCS you end up with a copy of an entire repaired row in L0. Over time if you
> repair you end up with multiple copies of a row in L0 - L5. This can make
> predicting disk usage confusing.
> Another issue is cleaning up tombstoned data. If a tombstone lives in level
> 1 and data for the cell lives in level 5 the data will not be reclaimed from
> disk until the tombstone reaches level 5.
> I propose we add a "major" compaction for LCS that forces consolidation of
> data to level 5 to address these.
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