Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/4188#issuecomment-73341528
@vanzin I don't think it does build a big command line though. I see:
```
val commands = prepareCommand(...) // List[String]
...
ctx.setCommands(commands)
```
The elements of that list can and should be escaped?
If I update `YarnClusterSuite` to add a `spark.executor.extraJavaOptions`
like `-Dfoo="one two three"` then the test fails... although just adding this
escaping routine to the args in `ExecutorRunnable` too does not fix that. Still
investigating...
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