rkhachatryan opened a new pull request #13822:
URL: https://github.com/apache/flink/pull/13822
## What is the purpose of the change
Depends on #13821.
The emitted event would allow to tear down "virtual channels" used to read
channel state on recovery with unaligned checkpoints and rescaling.
Upstream subpartitions are blocked upon sending this event and unblocked by
the downstream when all channels receive it.
## Verifying this change
- Added `ChannelPersistenceITCase.testUpstreamBlocksAfterRecoveringState`
to test emission and blocking on the upstream side
- Added `CheckpointedInputGateTest` to test alignment and unblocking on the
downstream side
## 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: yes
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? no
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