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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9345) LeveledCompactionStrategy bad performance
Date Mon, 11 May 2015 18:18:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14538340#comment-14538340
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Jonathan Ellis commented on CASSANDRA-9345:
-------------------------------------------

Alan, is this new behavior in trunk?  Did you try to repro in 2.1 or 2.0?

> 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
>             Fix For: 3.0
>
>         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.
> (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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