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From "Alan Boudreault (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9345) LeveledCompactionStrategy bad performance
Date Tue, 12 May 2015 12:54:59 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14539794#comment-14539794
] 

Alan Boudreault commented on CASSANDRA-9345:
--------------------------------------------

[~carlyeks] This is my tests graphs and data of trunk vs the dev branch: http://dl.alanb.ca/lcs-tests.tar.gz
. Feel free to close this ticket if you want to work only in 7409.

> 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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