wsry opened a new pull request #12034:
URL: https://github.com/apache/flink/pull/12034
## What is the purpose of the change
For unaligned checkpoint, task may consume data after the checkpoint barrier
before performing checkpoint which lead to consumption of duplicated data and
corruption of data stream.
More specifically, when the Netty thread notifies the checkpoint barrier for
the first time and enqueue a checkpointing task in the mailbox, the task thread
may still in data consumption loop and if it reads a new checkpoint barrier
from another channel it will not return to the mailbox and instead it will
continue to read data until a all data consumed or we have a full record,
meanwhile, the data after checkpoint barrier may be read and consumed which
lead to inconsistency.
This PR tries to fix the problem.
## Brief change log
- Return to mailbox after receiving a checkpoint barrier.
## Verifying this change
This change is already covered by existing tests.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / **no**)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / **no**)
- The serializers: (yes / **no** / don't know)
- The runtime per-record code paths (performance sensitive): (yes / **no**
/ don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (**yes** / no /
don't know)
- The S3 file system connector: (yes / **no** / don't know)
## Documentation
- Does this pull request introduce a new feature? (yes / **no**)
- If yes, how is the feature documented? (**not applicable** / docs /
JavaDocs / not documented)
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