Ngone51 opened a new pull request #25076: [SPARK-28302] [CORE] Make sure to generate unique output file for SparkLauncher on Windows URL: https://github.com/apache/spark/pull/25076 ## What changes were proposed in this pull request? When using SparkLauncher to submit applications **concurrently** with multiple threads under **Windows**, some apps would show that "The process cannot access the file because it is being used by another process" and remains in LOST state at the end. The issue can be reproduced by this [demo](https://issues.apache.org/jira/secure/attachment/12973920/Main.scala). After digging into the code, I find that, Windows cmd `%RANDOM%` would return the same number if we call it instantly(e.g. < 500ms) after last call. As a result, SparkLauncher would get same output file(spark-class-launcher-output-%RANDOM%.txt) for apps. Then, the following app would hit the issue when it tries to write the same file which has already been opened for writing by another app. We should make sure to generate unique output file for SparkLauncher on Windows to avoid this issue. ## How was this patch tested? Tested manually on Windows.
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