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From "Benedict (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-7519) Further stress improvements to generate more realistic workloads
Date Mon, 08 Sep 2014 01:09:28 GMT


Benedict commented on CASSANDRA-7519:

There were no merge conflicts from 2.1.0->2.1, so I missed this. I've ninja fixed.

I haven't resolved the ticket because, whilst it's been committed to 2.1.0, it's unclear if
it will be pushed back to 2.1.1 since the RC is up for vote. So the fixVersion is unknown.

> Further stress improvements to generate more realistic workloads
> ----------------------------------------------------------------
>                 Key: CASSANDRA-7519
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Benedict
>            Assignee: Benedict
>            Priority: Minor
>              Labels: tools
>             Fix For: 2.1.1
> We generally believe that the most common workload is for reads to exponentially prefer
most recently written data. However as stress currently behaves we have two id generation
modes: sequential and random (although random can be distributed). I propose introducing a
new mode which is somewhat like sequential, except we essentially 'look back' from the current
id by some amount defined by a distribution. I may possibly make the position only increment
as it's first written to also, so that this mode can be run from a clean slate with a mixed
workload. This should allow is to generate workloads that are more representative.
> At the same time, I will introduce a timestamp value generator for primary key columns
that is strictly ascending, i.e. has some random component but is based off of the actual
system time (or some shared monotonically increasing state) so that we can again generate
a more realistic workload. This may be challenging to tie in with the new procedurally generated
partitions, but I'm sure it can be done without too much difficulty.

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