[jira] [Created] (CASSANDRA-7980) cassandra-stress should support partial clustering column generation

["Benedict (JIRA)" <ji...@apache.org>]

Benedict created CASSANDRA-7980:
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             Summary: cassandra-stress should support partial clustering column generation
                 Key: CASSANDRA-7980
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7980
             Project: Cassandra
          Issue Type: Bug
            Reporter: Benedict
            Assignee: Branimir Lambov
            Priority: Minor


cassandra-stress generates its data randomly, in tiers, so that we can scroll through the partitions it generates without having to generate their entirety. The problem is that to support very large partitions (important for benchmarking certain cases, and acceptance testing) we have to have a large number of clustering columns - generally more than we would otherwise have, which changes the performance characteristics. We should effectively split each clustering column into a number of byte-ranges that become tiers for visitation. The only real complexity here is in obeying the size/count distribution range specified, which would be difficult for exponential distributions, however we could require the user specify the ranges, and distributions for each range, upfront. We could even treat them exactly like other column specifications, but as sub-specs within a given column in the yaml. Or, we could simply accept that we imperfectly follow the distribution in these situations.



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