venkata91 commented on pull request #32754:
URL: https://github.com/apache/spark/pull/32754#issuecomment-854059790


   > Can you please include the impact of these changes ?
   > For the cases we observed, what was the 'savings' for the individual 
changes ?
   > 
   > This will help quantify the amount of garbage saved for nontrivial spark 
applications.
   
   Added more details on the garbage accumulated and the impact after fixing 
them.
   Earlier the job used to be configured with driver memory of 40+gb and still 
run into heavy GC but after these fixes the driver memory is brought down to 
25gb and no long Full GC pauses. Now the Full GC pauses are much more 
streamlined.


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