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From "Ben Slater (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-12744) Randomness of stress distributions is not good
Date Tue, 23 May 2017 11:04:04 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-12744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16021038#comment-16021038
] 

Ben Slater commented on CASSANDRA-12744:
----------------------------------------

[~tjake] - just realised this one was still open. If you can kick off the tests again, I'd
be happy to dig into any issues.

> 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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