srowen commented on issue #23650: [SPARK-26728]Make rdd.unpersist blocking configurable URL: https://github.com/apache/spark/pull/23650#issuecomment-457612771 I would not add yet another config flag for this. It's already controllable by the caller, and should generally be up to the program to decide. However, I would support changing the default to `false` in Spark 3. I think that is a much more reasonable default, as it should be rare that someone wants to wait for it to unpersist.
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