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From "Jim Witschey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9522) Specify unset column ratios in cassandra-stress write
Date Tue, 30 Jun 2015 18:08:05 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9522?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14608766#comment-14608766
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Jim Witschey commented on CASSANDRA-9522:
-----------------------------------------

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

{code}
$ ./tools/bin/cassandra-stress write n=1000 -rate threads=50 -col n=FIXED\(50\) -insert row-population-ratio=uniform\(5..10\)
Invalid parameter row-population-ratio=uniform(5..10)
                                                                                         
                                                                                    
$ ./tools/bin/cassandra-stress write n=1000 -rate threads=50 -col n=FIXED\(50\) -insert row-population-ratio=fixed\(1\)/2
# expected stress output
{code}

I haven't tried specifying via a yaml file.

> 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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