tzulitai opened a new pull request #7553: [FLINK-11328] [core] Migrate all parameterless serializers to use new serialization compatibility API URL: https://github.com/apache/flink/pull/7553 ## What is the purpose of the change This PR migrates all parameterless serializers (in Flink, they happen to all be subclasses of `TypeSerializerSingleton`) to use the new serialization compatibility APIs, so that the serializers themselves are no longer Java-serialized into savepoints. ## Brief change log - edf6d59: This commit essentially does 2 things: 1) improve usability of the new `SimpleTypeSerializerSnapshot` base class, so that it may be used by serializers that have varying ways for instantiation, and 2) let all subclasses of `TypeSerializerSingleton` return their own implementation of a `SimpleTypeSerializerSnapshot`, while removing the base implementation of `snapshotConfiguration` in `TypeSerializerSingleton`. - 898f6c5: Some CEP serializers for NFA data structures use nested serializers, so they should actually use the `CompositeTypeSerializerSnapshot` snapshot class. This commit addresses that. - 74adb84 to b4910d4: Some cleanup in tests. - 79c85ca to 18187c0: Commits that add migration tests for the touched serializers. ## Verifying this change All new subclasses of `TypeSerializerSnapshotMigrationTestBase` should pass.
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