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[SPARK-28302] [CORE] Make sure to generate unique output file for SparkLauncher on Windows #25076

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[SPARK-28302] [CORE] Make sure to generate unique output file for SparkLauncher on Windows #25076

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b55dfc6
make sure to generate unique output file
Ngone51 Jul 8, 2019
9273f33
address comment
Ngone51 Jul 9, 2019
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5 changes: 5 additions & 0 deletions bin/spark-class2.cmd
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Expand Up @@ -63,7 +63,12 @@ if not "x%JAVA_HOME%"=="x" (

rem The launcher library prints the command to be executed in a single line suitable for being
rem executed by the batch interpreter. So read all the output of the launcher into a variable.
:gen
set LAUNCHER_OUTPUT=%temp%\spark-class-launcher-output-%RANDOM%.txt
rem SPARK-28302: %RANDOM% would return the same number if we call it instantly after last call,
rem so we should make it sure to generate unique file to avoid process collision of writing into
rem the same file concurrently.
if exist %LAUNCHER_OUTPUT% goto :gen
"%RUNNER%" -Xmx128m -cp "%LAUNCH_CLASSPATH%" org.apache.spark.launcher.Main %* > %LAUNCHER_OUTPUT%
for /f "tokens=*" %%i in (%LAUNCHER_OUTPUT%) do (
set SPARK_CMD=%%i
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