pnowojski commented on PR #21080:
URL: https://github.com/apache/flink/pull/21080#issuecomment-1295072883

   Hi @zhougit86 , I'm still not sure what's the value of this proposed 
improvement/fix. It:
   1. adds a bit of complexity to the already pretty complex system
   2. adds a new publicly exposed configuration option, that very very few 
people will actually know that it exists and even fewer how to use, while we 
would be forced to maintain forever
   
   Just in order to add built in Flink an unhealthy network detector and print 
potentially false warning? 🤔 Note that our netty handlers are not non blocking. 
In some cases, we are doing blocking I/O calls from the netty threads, so the 
heartbeats can be blocked for non negligible amount of time.


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