Github user mridulm commented on the issue:
https://github.com/apache/spark/pull/20091
@jiangxb1987 I am not sure I followed that completely.
`defaultParallelism` will always be present - either via explicit use
specification of `spark.default.parallelism` in spark conf by user or
implicitly obtained based on the scheduler backend (both of which are detailed
in `spark.default.parallelism` contract).
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