[GitHub] tillrohrmann opened a new pull request #6867: [FLINK-10580] Harden BootstrapTool#startActorSystem

[GitBox <gi...@apache.org>]

tillrohrmann opened a new pull request #6867: [FLINK-10580] Harden BootstrapTool#startActorSystem
URL: https://github.com/apache/flink/pull/6867
 
 
   ## What is the purpose of the change
   
   Instead of opening a socket to check whether a given port is free we simply start an
   ActorSystem with it an check whether it can bind to this port. This also solves the problem
   that a 0 port get resolved to a specific port which might get taken between closing the
   test socket and starting the ActorSystem.
   
   ## Verifying this change
   
   - Added `BootstrapToolsTest#testConcurrentActorSystemCreation` which failed without this change (non-deterministically)
   
   ## 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, 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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