Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/1341#issuecomment-48551197
I'd rather do it differently in that case, if you really care about it.
Instead of loading spark-env.sh, do this:
CMD_LINE_ARGS=
if [ $# != 0 ]; then
# print warning
CMD_LINE_ARGS="--dir $1"
fi
exec spark-daemon.sh .... $CMD_LINE_ARGS
This restores the previous behaviour while still warning the user.
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