StefanRRichter opened a new pull request #8431: [FLINK-12480] Introduce mailbox 
to StreamTask main-loop
URL: https://github.com/apache/flink/pull/8431
 
 
   ## What is the purpose of the change
   This PR sits on top of #8409 and introduces the mailbox approach to the 
`StreamTask`. It is the next sub-task in our effort to change the threading 
model of `StreamTask`
   
   ## Brief change log
   
   - New class `MailboxImpl` with interfaces.
   - Rewritten `StreamTask#run` that spins around default action and mailbox.
   
   ## Verifying this change
   Added unit tests for the mailbox, everything else is covered by existing 
tests.
   
   ## 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): (yes)
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, 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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