[SPARK-3734] DriverRunner should not read SPARK_HOME from submitter's environment #2586
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When using spark-submit in
clustermode to submit a job to a Spark Standalonecluster, if the JAVA_HOME environment variable was set on the submitting
machine then DriverRunner would attempt to use the submitter's JAVA_HOME to
launch the driver process (instead of the worker's JAVA_HOME), causing the
driver to fail unless the submitter and worker had the same Java location.
This commit fixes this by reading JAVA_HOME from sys.env instead of
command.environment.