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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