gaoyunhaii opened a new pull request #14820:
URL: https://github.com/apache/flink/pull/14820
## What is the purpose of the change
This PR enables triggering checkpoint barrier handle for non-source tasks.
To support checkpoints after some tasks finished, non-source tasks might
also receive RPC trigger of checkpoint after all their precedent tasks get
finished. In this case, it need to trigger checkpoint barrier handler to insert
barriers. This PR provides the functionality to notify checkpoint barrier on
RPC trigger
## Brief change log
*(for example:)*
- a3daa2b88a7c1609daf2bb55742971eabe5dacf0 refactors the current
implementation to expose CheckpointBarrierHandler.
- b4baae6e24556aec841fb1c4fcedfec234e3c0cd notifies the non-source stream
tasks' checkpoint barrier handler on RPC trigger.
- 326d8751ac2aac4255b5e94da8e8f46a424c55c5 fixes the tests that using
non-source task that directly perform checkpoint on trigger.
## Verifying this change
Added UT to verify that checkpoint barrier handler get triggered on RPC
checkpoint trigger.
## 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**
- If yes, how is the feature documented? **not applicable**
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