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https://issues.apache.org/jira/browse/KAFKA-14911?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias J. Sax updated KAFKA-14911:
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Priority: Minor (was: Major)
> Add system tests for rolling upgrade path of KIP-904
> ----------------------------------------------------
>
> Key: KAFKA-14911
> URL: https://issues.apache.org/jira/browse/KAFKA-14911
> Project: Kafka
> Issue Type: Test
> Reporter: Farooq Qaiser
> Assignee: Victoria Xia
> Priority: Minor
>
> As per [~mjsax] comment
> [here|https://github.com/apache/kafka/pull/10747#pullrequestreview-1376539752],
> we should add a system test to test the rolling upgrade path for
> [KIP-904|https://cwiki.apache.org/confluence/x/P5VbDg] which introduces a new
> serialization format for groupBy internal repartition topics and was
> implemented as part of https://issues.apache.org/jira/browse/KAFKA-12446
> There is `StreamsUpgradeTest.java` and `streams_upgrade_test.py` (cf
> `test_rolling_upgrade_with_2_bounces`) as a starting point.
> Might be best to do a similar thing as for FK-joins, and add a new test
> variation.
> The tricky thing about the test would be, to ensure that the repartition
> topic is not empty when we do the bounce, so the test should be setup
> accordingly.
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