Jon Bates created KAFKA-7591:
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Summary: Changelog retention period doesn't synchronise with
window-store size
Key: KAFKA-7591
URL: https://issues.apache.org/jira/browse/KAFKA-7591
Project: Kafka
Issue Type: Bug
Components: streams
Reporter: Jon Bates
When a new windowed state store is created, the associated changelog topic's
`retention.ms` value is set to `window-size + CHANGELOG_ADDITIONAL_RETENTION_MS`
h3. Expected Behaviour
If the window-size is updated, the changelog topic's `retention.ms` config
should be updated to reflect the new size
h3. Actual Behaviour
The changelog-topic's `retention.ms` setting is not amended, resulting in
possible loss of data upon application restart
n.b. Although it is easy to update changelog topic config, I logged this as
`major` due to the potential for data-loss for any user of Kafka-Streams who
may not be intimately aware of the relationship between a windowed store and
the changelog config
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