Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/7770#issuecomment-127329348
To clarify slightly, (@andrewor14, correct me if I'm wrong), these new
internal metrics are considered to be completely `private[spark]` right now, so
there's no `@DeveloperApi` guarantees for them yet. As a result, I'm not sure
that we necessarily have compatibility concerns here since we don't expose /
define any programmatic APIs around these metrics yet (in other words, I think
the use of accumulators is just an implementation detail).
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