shuai-xu opened a new pull request #7227: [FLINK-11059] [runtime] do not add 
releasing failed slot to free slots
URL: https://github.com/apache/flink/pull/7227
 
 
   
   ## What is the purpose of the change
   
   *This pr fix the bug that job master add back the slot when releasing to 
task executor failed due to timeout or so on, task executor may have already 
released the slot, but job master may continue deploy task to it.*
   
   ## Verifying this change
   
   This change added tests and can be verified as follows:
   
   *(example:)*
     - *Run SlotPoolTest*
   
   ## 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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