Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2512
Had an in-depth code walkthrough with @StefanRRichter - comments are
addresses as additional commits.
Comments:
- Use `StateDescriptor` as well for operator state
- For the `snapshotState()` and `prepareSnapshot()` calls, the checkpoint
timestamp should be passed as well.
- The Kafka Consumer should use the same state as the `snapshotState()`
interface, so as to allow for backwards compatible checkpoints/savepoints.
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