Github user vanzin commented on the issue:

    https://github.com/apache/spark/pull/16714
  
    Options put the burden on the user to figure things out (do I need to set 
this or not?). If you want to investigate whether you can trim more data (e.g. 
internal metrics that just mirror stuff already in TaskMetrics) then there 
would be value. But adding an option doesn't really help users, since aside 
from you, probably nobody will ever even look at those.


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