davidradl commented on code in PR #27455:
URL: https://github.com/apache/flink/pull/27455#discussion_r2716074235
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docs/content/docs/ops/upgrading.md:
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@@ -279,6 +279,9 @@ For more details, please take a look at the [savepoint
documentation]({{< ref "d
Savepoints are compatible across Flink versions as indicated by the table
below:
+**Note**: "Compatible" here refers specifically to compatibility of the
internal data format in
Review Comment:
The Jira indicates "This helps to avoid user confusion.". I am not sure how
to action "cover compatibility of SQL operators or other Upper-level changes".
It leads me to ask the questions
- how do I check the compatibility of SQL operators
- how can I check the other Upper-level changes
If I cannot do this, how will I know if my savepoint can be upgraded.
I wonder if we can as a minimum either:
- ask the user to investigate the code base with some guidance around their
save point. I think this would help as it would be a way forward for them.
Ideally we would document the criteria when the savepoints are compatible and
when they are not.
- give an example of an incompatible savepoint in each of these cases where
the internal data structure is compatible.
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