Github user tdas commented on the pull request:
https://github.com/apache/spark/pull/7600#issuecomment-125367702
Just so that the comment to a hidden thread is not lost, I am repeating it
here. For the `rateController: Option[RateController]` I propose this.
1. Let there be a object method RateController.isBackpressureEnabled, which
will return true if spark.streaming.backpressure.enabled.
2. Class ReceiverInputDStream will create a controller instance of
ReceiverRateController if the above method returns true. You may or may not
wrap that check in an object method, ReceiverRateController.create():
Option[RateController]
3. DirectKafkaRateController will create a conroller instance of
DirectKafkaRateController in the same way.
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