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Jonathan Ellis commented on CASSANDRA-11035:
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I actually think we may want this disabled for STCS-in-L0, since what you have
there is a whole bunch of recently flushed data that probably doesn't overwrite
itself much. So the overhead of a quadratic cardinality comparison is not
going to pay off much in terms of better compaction.
> Use cardinality estimation to pick better compaction candidates for STCS
> (SizeTieredCompactionStrategy)
> -------------------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-11035
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11035
> Project: Cassandra
> Issue Type: Improvement
> Components: Compaction
> Reporter: Wei Deng
>
> This was initially mentioned in this blog post
> http://www.datastax.com/dev/blog/improving-compaction-in-cassandra-with-cardinality-estimation
> but I couldn't find any existing JIRA for it. As stated by [~jbellis],
> "Potentially even more useful would be using cardinality estimation to pick
> better compaction candidates. Instead of blindly merging sstables of a
> similar size a la SizeTieredCompactionStrategy." The L0 STCS in LCS should
> benefit as well.
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