[
https://issues.apache.org/jira/browse/KAFKA-7481?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16658038#comment-16658038
]
Ismael Juma commented on KAFKA-7481:
------------------------------------
Thanks for the KIP [~hachikuji], it's very helpful to have a write-up to
evaluate the options better. After thinking about it some more, I think 3
configs is going to be too complicated to explain and the benefit is not
enough. Instead, we should change the documentation of
`inter.broker.protocol.version` so that it's not safe to change it back after
an upgrade. The recommendation would then be to stick with the old version for
some time and only bump to the new version once a downgrade was no longer
necessary.
Thoughts? cc [~ewencp] and [~junrao] who may also have some thoughts.
> 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
> Priority: Blocker
> 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?
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
