Handle state evolution without breaking state compatibility #245
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Looks good. Thanks. Tests were left in Flink 1.x API, however it would be better to make them available for both Flink versions. I do not have an idea how this can be done at the moment. We should not duplicate tests, because it will add even more maintenance work. |
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Hi @novakov-alexey,
As designed in the issue #240, here is my proposal to handle state evolution without breaking state compatibility.
ScalaCaseObjectSerializerhas not the issue because it doesn't serialize serializers, but I addedMapSerializerin addition of the previous list.Write a test that reproduces the issue and shows this PR fixes it was hard, please have a look at
MapSerializerSnapshotTest. I didn't write a test for each serializer snapshot, but the logic is the same.I was surprised to see no tests for Flink 2, I created the root test folder, but maybe tests for Flink 1 should be duplicated for Flink 2 also?
As said in the issue, I can also do these changes for Flink 1, but it will break the state compatibility.
Thanks