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https://issues.apache.org/jira/browse/SPARK-41911?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17655343#comment-17655343
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Martin Grund commented on SPARK-41911:
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I think the first part would be to identify which messages would need a 
version, but the version does not need to be the first field in the proto.

> Add version fields to Connect proto
> -----------------------------------
>
>                 Key: SPARK-41911
>                 URL: https://issues.apache.org/jira/browse/SPARK-41911
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Connect
>    Affects Versions: 3.4.0
>            Reporter: Rui Wang
>            Priority: Major
>
> We may need this to help maintain compatibility. Depending on the concrete 
> protocol design, we may use field number 1 for version fields thus may cause 
> breaking changes on existing proto messages. 



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