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From "Ariel Weisberg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7933) Update cassandra-stress README
Date Mon, 12 Jan 2015 18:48:35 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7933?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14273931#comment-14273931
] 

Ariel Weisberg commented on CASSANDRA-7933:
-------------------------------------------

Brought over from CASSANDRA-8597. Stress needs additional documentation to introduce concepts
and verbiage as well as common workflows. Most first time users will not be familiar with
C* terminology .

There are two dimensions data distribution and access distribution and knowing all the knobs
for describing data distribution (# partition, # cells/rows, #size of cells) and access distribution
(across partitions, across cells within partitions, random vs sequential strides, # of rows/cells
to select) would be helpful. I think some times these parameters are linked as well. Understanding
data and access distribution is key to realistically simulating workloads.

A recipe of how you do a bulk load and then transition to some other mixed read/write pattern
with matching schema. A recipe for single column rows as well as multi-column or very wide
rows.

It's also worth mentioning in the distribution section that you can get the tool to print
a summary of distributions so you know what the parameters are doing.

> Update cassandra-stress README
> ------------------------------
>
>                 Key: CASSANDRA-7933
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7933
>             Project: Cassandra
>          Issue Type: Task
>            Reporter: Benedict
>            Assignee: Philip Thompson
>            Priority: Minor
>             Fix For: 2.1.3
>
>         Attachments: CASSANDRA-7933.txt
>
>
> There is a README in the tools/stress directory. It is completely out of date.



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