Github user hhbyyh commented on the issue:
https://github.com/apache/spark/pull/18728
Thanks for your attention. @srowen
The temp dir cleanup function is implemented in trait
`DefaultReadWriteTest` which extends `TempDirectory`, not from `SparkFunSuite`.
And as you said, the beforeAll and afterAll in `ValidatorParamsSuiteHelpers`
was never really triggered. Thus it's creating temp files in the runtime
directory and not deleting them.
Removing the SparkFunSuite will cause the === failed in the
`compareParamMaps` function in `ValidatorParamsSuiteHelpers`. Shall we remove
it?
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