LantaoJin opened a new pull request #28385:
URL: https://github.com/apache/spark/pull/28385
### What changes were proposed in this pull request?
In our production, we find that many shuffle files could be located in
/hadoop/2/yarn/local/usercache/b_carmel/appcache/application_1586487864336_4602/*null*-107d4e9c-d3c7-419e-9743-a21dc4eaeb3f/3a
The Util.createDirectory() uses a default parameter "spark"
```
def createDirectory(root: String, namePrefix: String = "spark"): File
```
But in some cases, the actual namePrefix is null. If the method is called
with null, then the default value would not be applied.
### Does this PR introduce any user-facing change?
No
### How was this patch tested?
Add a UT.
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