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From "Marcus Eriksson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11035) Use cardinality estimation to pick better compaction candidates for STCS (SizeTieredCompactionStrategy)
Date Thu, 18 Feb 2016 15:58:18 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15152487#comment-15152487
] 

Marcus Eriksson commented on CASSANDRA-11035:
---------------------------------------------

I pushed a version with this configurable https://github.com/krummas/cassandra/commits/marcuse/11035
for tests

{code}ALTER TABLE x.y WITH compaction = {'class': 'SizeTieredCompactionStrategy', 'overlap_compaction':true};{code}



> 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
>            Assignee: Marcus Eriksson
>
> 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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