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From "T Jake Luciani (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9522) Specify unset column ratios in cassandra-stress write
Date Tue, 30 Jun 2015 18:12:08 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14608779#comment-14608779
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T Jake Luciani commented on CASSANDRA-9522:
-------------------------------------------

bq. What distributions can you specify via the command line? FIXED works, but UNIFORM doesn't:

It's a *Ratio* so needs to be divided be a number. like fixed(1)/2

> Specify unset column ratios in cassandra-stress write
> -----------------------------------------------------
>
>                 Key: CASSANDRA-9522
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9522
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Jim Witschey
>            Assignee: T Jake Luciani
>             Fix For: 3.0 beta 1
>
>
> I'd like to be able to use stress to generate workloads with different distributions
of unset columns -- so, for instance, you could specify that rows will have 70% unset columns,
and on average, a 100-column row would contain only 30 values.
> This would help us test the new row formats introduced in 8099. There are a 2 different
row formats, used depending on the ratio of set to unset columns, and this feature would let
us generate workloads that would be stored in each of those formats.



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