Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/1715#issuecomment-50955875
Discussed with @pwendell offline, record a summary here:
1. We leave the current option passing mode as is to keep downward
compatibility
1. Introducing `--` as a new application option passing mode, but should be
used mutually exclusive with primary resource (either Jar file or Python file).
Users need to use `--jars` and/or `--py-files` to specify the primary
resource if they'd like to use `--` as application option separator.
So basically, we'll have this:
```
if primary resource exists:
resort to the old option passing mode
else if -- exists:
pass everything after -- to the application
if --py-files exists:
isPyhon = true
else:
isPython = false
else:
report error
```
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