JingGe opened a new pull request #19145:
URL: https://github.com/apache/flink/pull/19145
## What is the purpose of the change
Found a potential visibility issue and some typos while reading the mailbox
code.
The instance variable mainMailboxExecutor in StreamTask is package-private
but only used in subclasses that are in the same package. The visibility should
be protected.
## Brief change log
- change the instance variable mainMailboxExecutor in StreamTask to be
protected
- fix the wrong local variable name in MailboxProcessor
- fix some typos in java doc
## 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, 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**)
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