Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/17869
@heary-cao, could you try to add `Utils.clearLocalRootDirs()` in the first
of `beforeEach` and in the last of `afterEach` and check out the results?
It looks initial local directory is cached in `Utils.localRootDirs` and
then it keeps returning this directory set before even after setting
`conf.set("spark.local.dir", tempDir.getAbsolutePath)`.
Also, I quickly skimmed after running `grep -r "spark.local.dir" . | grep
Suite | grep ".scala"` and I see two suspicious instances as below:
```
./mllib/src/test/scala/org/apache/spark/ml/recommendation/ALSSuite.scala:
conf.set("spark.local.dir", localDir.getAbsolutePath)
./mllib/src/test/scala/org/apache/spark/ml/recommendation/ALSSuite.scala:
conf.set("spark.local.dir", localDir.getAbsolutePath)
```
Could you check out both if you have some time?
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