[GitHub] tillrohrmann opened a new pull request #7606: [FLINK-10774] Rework lifecycle management of partitionDiscoverer in FlinkKafkaConsumerBase

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tillrohrmann opened a new pull request #7606: [FLINK-10774] Rework lifecycle management of partitionDiscoverer in FlinkKafkaConsumerBase
URL: https://github.com/apache/flink/pull/7606
 
 
   ## What is the purpose of the change
   
   This PR reworks the lifecycle management of the `FlinkKafkaConsumerBase#partitionDiscoverer` such that it will always be closed in the `close()` method. This implies that all users of this class need to call `close()` in order to properly clean up resources.
   
   cc @stevenzwu @tzulitai 
   
   ## Brief change log
   
   - Remove closing of `partitionDiscoverer` from `#run` method
   - separate `FlinkKafkaConsumerBase#cancel` and `#close` such that cancel is non blocking and `close` will release all required resources
   
   ## Verifying this change
   
   - Added tests: `FlinkKafkaConsumerBaseTest#testClosePartitionDiscovererWhenOpenThrowException`, `#testClosePartitionDiscovererWhenCreateKafkaFetcherFails`, `#testClosePartitionDiscovererWhenKafkaFetcherFails` and `#testClosePartitionDiscovererWithCancellation`
   
   ## 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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