Jason Gustafson created KAFKA-7481:
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Summary: Consider options for safer upgrade of offset commit value
schema
Key: KAFKA-7481
URL: https://issues.apache.org/jira/browse/KAFKA-7481
Project: Kafka
Issue Type: Bug
Reporter: Jason Gustafson
Fix For: 2.1.0
KIP-211 and KIP-320 add new versions of the offset commit value schema. The use
of the new schema version is controlled by the `inter.broker.protocol.version`
configuration. Once the new inter-broker version is in use, it is not possible
to downgrade since the older brokers will not be able to parse the new schema.
The options at the moment are the following:
1. Do nothing. Users can try the new version and keep
`inter.broker.protocol.version` locked to the old release. Downgrade will still
be possible, but users will not be able to test new capabilities which depend
on inter-broker protocol changes.
2. Instead of using `inter.broker.protocol.version`, we could use
`message.format.version`. This would basically extend the use of this config to
apply to all persistent formats. The advantage is that it allows users to
upgrade the broker and begin using the new inter-broker protocol while still
allowing downgrade. But features which depend on the persistent format could
not be tested.
Any other options?
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