Github user 10110346 commented on the issue:
https://github.com/apache/spark/pull/22723
In fact, `BinaryFileRDD ` uses `max(defaultParallelism, minPartitions)`:
`BinaryFileRDD --->setMinPartitions--->Math.max(sc.defaultParallelism,
minPartitions)`.
In addition, for this unit test:
https://github.com/apache/spark/blob/b80bf66a8109faa7f58d45b92417a981666866a0/core/src/test/scala/org/apache/spark/FileSuite.scala#L304
if we set `spark.default.parallelism=3`, the result will not be what we
expected.
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