Github user squito commented on the issue:
https://github.com/apache/spark/pull/20532
I can see why you want this sometimes, but I'm trying to figure out if its
really valuable for users in general. You could always add a custom listener
to log this info. It would go into separate file, not the std event log file,
which means you'd have a little more work to do to stitch them together. OTOH
that could be a good thing, as it means these history server wouldn't have to
parse those extra lines.
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