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https://issues.apache.org/jira/browse/CASSANDRA-3929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13210358#comment-13210358
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Sylvain Lebresne commented on CASSANDRA-3929:
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Agreed, it's hard to do efficiently. What is easy to do is to write a
compaction strategy (or have a strategy option) that only keeps the N first
columns on each compaction. Of course, that doesn't guarantee that you will
only get the N most recent columns but in practice that would fairly
efficiently get rid of the excess data, which I believe is mostly what people
care about. Basically it would really just be "we'll discard everything we know
is out of the N first columns". I suspect that in practice that may be the good
trade-off, but given it's not perfect I've always though that it probably make
more sense as an externally contributed compaction strategy.
> Support row size limits
> -----------------------
>
> Key: CASSANDRA-3929
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3929
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Jonathan Ellis
> Priority: Minor
> Labels: ponies
>
> We currently support expiring columns by time-to-live; we've also had
> requests for keeping the most recent N columns in a row.
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