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https://issues.apache.org/jira/browse/CASSANDRA-9345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14538919#comment-14538919
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Alan Boudreault commented on CASSANDRA-9345:
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After more investigation and testing, the issue is only in the latest
CASSANDRA-7409 branch. I had assumed the LCS MOL additions had no impact on the
standard LCS, which seem to be false. I'll talk with Carl tomorrow about this.
> LeveledCompactionStrategy bad performance
> -----------------------------------------
>
> Key: CASSANDRA-9345
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9345
> Project: Cassandra
> Issue Type: Bug
> Reporter: Alan Boudreault
> Assignee: Carl Yeksigian
> Attachments: temperature.yaml
>
>
> While working on CASSANDRA-7409, we noticed that there were some bad
> performance with LCS. It seems that the compaction is not triggered as it
> should. The performance is really bad when using low heap but we can also see
> that using a big heap there are something wrong with the number of
> compactions.
> I can only reproduce this issue in trunk. 2.1 seems OK. Here are the graphs
> that compare 2.1 vs trunk (Take care when visualizing the graphs, the y-axis
> scales differ due to some peaks):
> http://dl.alanb.ca/perf/lcs-2.1-vs-trunk-LH.html
> http://dl.alanb.ca/perf/lcs-2.1-vs-trunk-BH.html
> I've attached the stress yaml config used for this test.
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