Github user tdas commented on the issue:
https://github.com/apache/spark/pull/15307
- Backpressure/rate limiting will be separate, future PR. This patch is
purely for monitoring existing stuff, not taking any actions.
- Are you talking about the overheads of SQLMetrics? Most SQL operators
already have SQL metrics in them, and I believe that they had very little
overheads. The only new metric I am adding is the stateful operators, and there
the overheads should be equally trivial.
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