Github user ericl commented on the pull request:
https://github.com/apache/spark/pull/12248#issuecomment-207913175
Yes exactly, this is for implementing functionality such as tracing, where
to users *any* existing code modification may be too burdensome due to e.g. too
much plumbing or libraries they cannot modify.
It's the same argument for thread-locals, but in this case spanning driver
-> worker interactions.
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