[GitHub] [spark] cloud-fan opened a new pull request #24231: [minor] remove import scala.collection.Set in TaskSchedulerImpl

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

cloud-fan opened a new pull request #24231: [minor] remove import scala.collection.Set in TaskSchedulerImpl
URL: https://github.com/apache/spark/pull/24231
 
 
   ## What changes were proposed in this pull request?
   
   I was playing with the scheduler and found this weird thing. In `TaskSchedulerImpl` we import `scala.collection.Set` without any reason. This is bad in practice, as it silently changes the actual class when we simply type `Set`, which by default should point to the immutable set.
   
   This change only affects one method: `getExecutorsAliveOnHost`. I checked all the caller side and none of them need a general `Set` type.
   
   ## How was this patch tested?
   
   N/A

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