spark-class code.

[Mahesh Sawaiker <ma...@persistent.com>]

Hi,
Excuse my low understand of shell script, but can someone explain in detail what this particular piece of code in spark-class does?
I am trying to run some code with a customized jdk called hot tub https://github.com/dsrg-uoft/hottub

There was a specific problem with the line that prints $? , after I replaced it with just some text, it started to work fine.


build_command() {
  "$RUNNER" -Xmx128m -cp "$LAUNCH_CLASSPATH" org.apache.spark.launcher.Main "$@"
  printf "%d\0" $?
}

# Turn off posix mode since it does not allow process substitution
set +o posix
CMD=()
while IFS= read -d '' -r ARG; do
  CMD+=("$ARG")
done < <(build_command "$@")

COUNT=${#CMD[@]}
LAST=$((COUNT - 1))
LAUNCHER_EXIT_CODE=${CMD[$LAST]}

Thanks,
Mahesh
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