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https://issues.apache.org/jira/browse/KAFKA-20096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18055858#comment-18055858
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Arpit Goyal commented on KAFKA-20096:
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[~mjsax] can i pick this up ?
> RocksDB compatibility not documented
> ------------------------------------
>
> Key: KAFKA-20096
> URL: https://issues.apache.org/jira/browse/KAFKA-20096
> Project: Kafka
> Issue Type: Improvement
> Components: docs, streams, system tests
> Affects Versions: 4.0.0
> Reporter: Matthias J. Sax
> Priority: Critical
>
> With 4.0 release, we upgraded RocksDB from 7.9 to 9.7
> (https://issues.apache.org/jira/browse/KAFKA-15443) – however, we did miss
> that RocksDB introduces a file format version bump from version 5 to version
> 6 with RocksDB 8.6.
> While this does not impact the upgrade path, it does impact the downgrade
> path. This limitation is no documented though. – We should also investigate
> `RocksDBConfigSetter` which seems to allow to configure the used file-format
> version via `tableconfig.setFormVersion`.
> We should also double check system test coverage for upgrade/downgrade path
> with RocksDB – ideally we should catch such issue; seems there is some
> testing gap.
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