pnowojski opened a new pull request #13008:
URL: https://github.com/apache/flink/pull/13008
`checkpointStartDelayNanos` for `SourceStreamTask` can be measured how long
did it take for the checkpoint triggering RPC call to finally start executing
inside the mailbox thread. If the mailbox is busy, for example SourceFunction
is backpressured, this time can be quite significant.
This PR also simplifies `MultipleInputStreamTaskTestHarnessBuilder`.
## Brief change log
This change added new test to cover for new metric.
## 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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