StephanEwen opened a new pull request #13512:
URL: https://github.com/apache/flink/pull/13512
## What is the purpose of the change
This adds the `NumberSequenceSource` that generates a data stream of
numbers. This is a useful source for testing, debugging, or to simply have a
stream of placeholder events.
A number-sequence source currently exists in the form of
`env.generateSequence(from to)` based on the legacy Source API.
The source added here should in a later commit replace that implementation
(the `StatefuSequenceSource`).
## Verifying this change
This test adds a simple unit test for the checkpoint/restore functionality.
The source is used in various integration tests already, we hence do not add
an additional end-to-end test.
## 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, Kubernetes/Yarn/Mesos, ZooKeeper: **no**
- The S3 file system connector: **no**
## Documentation
- Does this pull request introduce a new feature? **no** (replaces
existing)
- If yes, how is the feature documented? **not applicable**
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