[GitHub] stevenzwu commented on issue #7020: [FLINK-10774] [Kafka] connection leak when partition discovery is disabled an…

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stevenzwu commented on issue #7020: [FLINK-10774] [Kafka] connection leak when partition discovery is disabled an…
URL: https://github.com/apache/flink/pull/7020#issuecomment-438384937
 
 
   @tillrohrmann 
   
   > shouldn't we close the partitionDiscoverer in the open method in case of a failure. Moreover, we could also close it there in the case if automatic partition discovery is disabled. 
   
   right now, the if-else check of partition discovery is done in `run` method to decide if we need to close the `partitionDiscoverer` before `runFetchLoop`. I didn't want to change that, unless we want to move the starting of `discoveryLoopThread` into open method as well. is that what you have in mind?
   
   I was thinking `cancel` method as the catch/finally block in Java. Plus it was the place where we close `partitionDiscoverer` for the enabled case. I though it might makes sense to ensure the cleanup in `cancel` method for both disabled and enabled cases
   
   > in line FlinkKafkaConsumerBase.java:721 fails with an exception? 
   
   line 721 is for the partition discovery enabled case, partitionDiscoverer is closed in the cancel method in line 748

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