Github user jinxing64 commented on the issue:
https://github.com/apache/spark/pull/16989
Checking the code:
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/internal/config/ConfigProvider.scala#L59
`SparkConfigProvider` just check if the key is in JMap, if not return the
default value. It doesn't check the alternatives.
I think it seems this is the reason
`org.apache.spark.memory.TaskMemoryManagerSuite.offHeapConfigurationBackwardsCompatibility
` fails.
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