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https://issues.apache.org/jira/browse/SPARK-31591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Takeshi Yamamuro resolved SPARK-31591.
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Resolution: Not A Problem
See: https://github.com/apache/spark/pull/28385#issuecomment-620941771
> namePrefix could be null in Utils.createDirectory
> -------------------------------------------------
>
> Key: SPARK-31591
> URL: https://issues.apache.org/jira/browse/SPARK-31591
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 3.0.0
> Reporter: Lantao Jin
> Priority: Minor
>
> 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"
> {code}
> def createDirectory(root: String, namePrefix: String = "spark"): File = {
> {code}
> But in some cases, the actual namePrefix is null. If the method is called
> with null, then the default value would not be applied.
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