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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