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Posted to commits@cassandra.apache.org by "Joshua McKenzie (JIRA)" <ji...@apache.org> on 2017/01/17 15:06:26 UTC

[jira] [Commented] (CASSANDRA-12744) Randomness of stress distributions is not good

    [ https://issues.apache.org/jira/browse/CASSANDRA-12744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15826180#comment-15826180 ] 

Joshua McKenzie commented on CASSANDRA-12744:
---------------------------------------------

[~tjake] - is this patch available?

> Randomness of stress distributions is not good
> ----------------------------------------------
>
>                 Key: CASSANDRA-12744
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12744
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>            Reporter: T Jake Luciani
>            Assignee: T Jake Luciani
>            Priority: Minor
>              Labels: stress
>             Fix For: 3.0.x
>
>
> The randomness of our distributions is pretty bad.  We are using the JDKRandomGenerator() but in testing of uniform(1..3) we see for 100 iterations it's only outputting 3.  If you bump it to 10k it hits all 3 values. 
> I made a change to just use the default commons math random generator and now see all 3 values for n=10



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