Github user jerryshao commented on the issue:
https://github.com/apache/spark/pull/11994
@rxin , thanks for your comment. The key motivation of this PR is to expose
the metrics Sink/Source interface for third-party plugins, so that we don't
need to maintain every different Sink/Source in spark core, like proposal
#19775 . I agree with you that exposing Codahale metrics object is not a good
choice, let me think more on the interface design.
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