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https://issues.apache.org/jira/browse/KAFKA-1888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14541118#comment-14541118
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Geoffrey Anderson commented on KAFKA-1888:
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Just making sure you're aware of work we're doing at Confluent on system tests. 
I'll be posting a KIP for this soon, but here's some info:

The original plan is sketched here:
https://cwiki.apache.org/confluence/display/KAFKA/System+Test+Improvements

This is the core library/test framework (WIP) which aids in writing and running 
the tests
https://github.com/confluentinc/ducktape/

This has system tests we've written to date for the Confluent Platform
https://github.com/confluentinc/muckrake

> Add a "rolling upgrade" system test
> -----------------------------------
>
>                 Key: KAFKA-1888
>                 URL: https://issues.apache.org/jira/browse/KAFKA-1888
>             Project: Kafka
>          Issue Type: Improvement
>          Components: system tests
>            Reporter: Gwen Shapira
>            Assignee: Abhishek Nigam
>             Fix For: 0.9.0
>
>         Attachments: KAFKA-1888_2015-03-23_11:54:25.patch
>
>
> To help test upgrades and compatibility between versions, it will be cool to 
> add a rolling-upgrade test to system tests:
> Given two versions (just a path to the jars?), check that you can do a
> rolling upgrade of the brokers from one version to another (using clients 
> from the old version) without losing data.



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