StephanEwen opened a new pull request #13385:
URL: https://github.com/apache/flink/pull/13385
## What is the purpose of the change
This PR fixes bugs in the connector base (`SourceReaderBase` and
`SplitFetcher`) availability logic.
This could previously lead to conditions where the reader was done (all
`SplitFetchers` idle) but this was never recognized.
The result was deadlocking jobs.
## Brief change log
The fix contains two steps, the problem and rational is described in the
Jira issues:
- https://issues.apache.org/jira/browse/FLINK-18128
- https://issues.apache.org/jira/browse/FLINK-19223
## Verifying this change
This change is partially covered by existing tests and also adds tests. See
changes in `SplitFetcherTest`.
## 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): **yes**
- 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**
- If yes, how is the feature documented? **not applicable**
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