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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