StefanRRichter opened a new pull request #7010: [FLINK-10353][kafka] Support change of transactional semantics in Kaf… URL: https://github.com/apache/flink/pull/7010 …ka Producer with existing state ## What is the purpose of the change This PR changes `FlinkKafkaProducer` and `FlinkKafkaProducer011` to support a change of transactional semantics when restoring from existing state, e.g. a savepoint. ## Brief change log - Introduced `KafkaTransactionState#isTransactional` to distinguish which transactional handling should be applied instead of relying on what is currently configured. - Call `initializeUserContext` in `TwoPhaseCommitSinkFunction` for all cases that did not recover a user context. - Consider removing tranactional id from the properties when creating a new producer to deactivate transactional semantics if no longer required. ## Verifying this change Added `FlinkKafkaProducer(11)ITCase#testMigrateFromAtLeastOnceToExactlyOnce` and `#testMigrateFromAtExactlyOnceToAtLeastOnce` ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (no) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (no) - The serializers: (no) - The runtime per-record code paths (performance sensitive): (no) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no) - The S3 file system connector: (no) ## Documentation - Does this pull request introduce a new feature? (no) - If yes, how is the feature documented? (not applicable)
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