[jira] [Commented] (CASSANDRA-9345) LeveledCompactionStrategy bad performance

["Carl Yeksigian (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-9345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14567395#comment-14567395 ] 

Carl Yeksigian commented on CASSANDRA-9345:
-------------------------------------------

No, nothing new on this ticket. Since this will be in 3.x, focusing on CASSANDRA-6477 first, then I'll look at this after.

> 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
>
>
> --> This issue doesn't affect any release and is only reproducible in a dev branch 
> 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.
> Here are the graphs that compare 2.1 vs the dev branch (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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