StefanRRichter commented on issue #7009: [FLINK-10712] Support to restore state when using RestartPipelinedRegionStrategy URL: https://github.com/apache/flink/pull/7009#issuecomment-456105318 I think I agree with the assessment of the existing operators. About adding a `RecoveryMode` to consider, would that mean that we would prevent all jobs that use union state to work with partial recovery? I think if we just consider a few popular operators like `KafkaConsumer`, that would already prevent a lot of jobs from using different recovery modes. I can see that this comes from the concern about existing code that uses union state. However, stricly speaking it should not be a regression because those recovery modes previously did not support state recovery at all. We also cannot prevent users from making wrong implementations, so I feel like a good thing to do is document what to care care for union state when using such recovery modes.
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