aljoscha opened a new pull request #12361:
URL: https://github.com/apache/flink/pull/12361
## What is the purpose of the change
We migrate all serializer upgrade tests from
`TypeSerializerSnapshotMigrationTestBase` to `TypeSerializerUpgradeTestBase`.
Additionally, we add snapshots for Flink 1.11 for all the serializers. This
will give us test coverage from 1.11 onward for serializer compatibility.
This is work by @klion26 and me, I am mostly the reviewer but putting up
this PR to have a paper trail.
And thanks a lot to @klion26 for working on this gigantic task with me! 🎊
## Brief change log
- add Flink 1.11 `MigrationVersion`
- add snapshots for Flink 1.11, these are from the code added in later
commits but we add them to the repo first so that the tests never fail
afterwards
- upgrade test base for Flink 1.11
- convert individual tests
cc @klion26 Could you do a final review?
cc @tzulitai
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