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From "Joshua McKenzie (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Deleted] (CASSANDRA-12744) Randomness of stress distributions is not good
Date Tue, 17 Jan 2017 15:42:26 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-12744?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Joshua McKenzie updated CASSANDRA-12744:
----------------------------------------
    Comment: was deleted

(was: I am on leave until Monday 30 Jan. If you need an immediate response please contact
[1]sales@instaclustr.com or [2]support@instaclustr.com as appropriate. For less urgent queries,
I will be checking email every couple of days and respond or redirect. Cheers Ben Slater Instaclustr

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————————Ben SlaterChief Product Officer[3]Instaclustr: Cassandra + Spark -
Managed | Consulting | Support[4]www.instaclustr.com

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> 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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