Github user bdzimmer commented on the pull request:
https://github.com/apache/spark/pull/7345#issuecomment-122372502
start-slave.sh and slaves.sh pass through all of their args. But
start-slaves.sh does not:
```sh
"$sbin/slaves.sh" cd "$SPARK_HOME" \; "$sbin/start-slave.sh"
"spark://$SPARK_MASTER_IP:$SPARK_MASTER_PORT"
```
But even if start-slaves.sh did pass additional arguments to the slaves.sh
call, I'm not sure if there is a good way to use slaves.sh to invoke a command
that will result in each node's unique hostname being passed to start-slave.sh
(slaves.sh escapes spaces in its arguments, making it difficult to pass a
quoted, backticked command with arguments as an argument). That's why I
suggested an optional flag for start-slave.sh.
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