Github user pwendell commented on a diff in the pull request: https://github.com/apache/spark/pull/1845#discussion_r16496323 --- Diff: bin/spark-class --- @@ -146,10 +155,28 @@ if $cygwin; then fi export CLASSPATH -if [ "$SPARK_PRINT_LAUNCH_COMMAND" == "1" ]; then - echo -n "Spark Command: " 1>&2 - echo "$RUNNER" -cp "$CLASSPATH" $JAVA_OPTS "$@" 1>&2 - echo -e "========================================\n" 1>&2 +# In Spark submit client mode, the driver is launched in the same JVM as Spark submit itself. +# Here we must parse the properties file for relevant "spark.driver.*" configs before launching +# the driver JVM itself. Instead of handling this complexity in Bash, we launch a separate JVM +# to prepare the launch environment of this driver JVM. + +if [ -n "$SPARK_SUBMIT_BOOTSTRAP_DRIVER" ]; then + # This is used only if the properties file actually contains these special configs + # Export the environment variables needed by SparkSubmitDriverBootstrapper + export RUNNER + export CLASSPATH + export JAVA_OPTS + export OUR_JAVA_MEM + export SPARK_CLASS=1 + shift # Ignore main class and use our own --- End diff -- Just so I understand - is this only ever used when the main class is `SparkSubmit`? It might be good to say that in the comment. The way it is now makes it sound like we could substitute a different class from the one that was specified, but in fact, all this does is ignore the class here and we hard code it in the bootstrapper.
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