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https://issues.apache.org/jira/browse/KAFKA-4088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15437930#comment-15437930
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Ismael Juma commented on KAFKA-4088:
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Thanks for filing this. I think what we should do is basically extend all of
our upgrade tests to include MirrorMaker. Would that make sense?
> Add regression check for KAFKA-4073
> -----------------------------------
>
> Key: KAFKA-4088
> URL: https://issues.apache.org/jira/browse/KAFKA-4088
> Project: Kafka
> Issue Type: Test
> Reporter: Geoff Anderson
>
> The patch for KAFKA-4073 fixed an issue introduced in 0.10.0.1, it may be
> worth adding a regression test
> Ideally this would be a unit test, but it's not immediately clear how to do
> so since it's hard to produce a pre-0.10.0 message through the producer api
> in 0.10.0
> If we were to write a system test, it would look something like:
> Setup:
> - Two small kafka clusters, 0.9.0.X (source), and 0.10.0.X (destination)
> - 0.9.0.X mirror maker from source to destination
> Produce messages with 0.9.X producer to source brokers.
> upgrade source brokers to 0.10.0.1
> upgrade mirror maker to 0.10.0.1 (don't upgrade 0.9 producer)
> This should reveal the problem if run without the fix introduced in KAFKA-4073
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