Github user CodingCat commented on the issue:
https://github.com/apache/spark/pull/11994
I see, I didn't recognize that the same registry is used to for source as
well.
in this case, even we have some way to eliminate MetricsRegistry from the
API signature, haven't we still introduced it in an implicit way? (i.e. user
has to ensure that they use the compatible version of codehale with the one we
used to register sources?)
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