Github user bellemare commented on the issue:
https://github.com/apache/incubator-predictionio/issues/337
Ah geez, I realize now that I may have made a mistake.
```
"SPARK_YARN_USER_ENV" -> sys.env.filter(kv => kv._1.startsWith("PIO_")).
map(kv => s"${kv._1}=${kv._2}").mkString(",")).run())
Note the map: kv => s"${kv._1}=${kv._2}"
```
This indicates that it does INDEED create a key=value pair.... so I must
have an empty parameter that I am setting, which is a known Yarn bug
(https://issues.apache.org/jira/browse/YARN-3768). That being said, I could not
find an empty parameter in my debug logging. Weird.
I'll close this for now, since it does not seem to be the case that my
reported issue is a bug.
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