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Posted to commits@cassandra.apache.org by "Ben Slater (JIRA)" <ji...@apache.org> on 2017/06/06 04:12:18 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=16038091#comment-16038091 ]
Ben Slater commented on CASSANDRA-12744:
----------------------------------------
Looks like the tests failures are unrelated? Are we OK to commit?
> 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: Ben Slater
> Priority: Minor
> Labels: stress
> Fix For: 4.0
>
> Attachments: CASSANDRA_12744_SeedManager_changes-trunk.patch
>
>
> 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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