Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/3943#discussion_r23246536
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnSparkHadoopUtil.scala ---
@@ -223,4 +225,43 @@ object YarnSparkHadoopUtil {
)
}
+ /**
+ * Expand environment variable using Yarn API.
+ * If environment.$$() is implemented, return the result of it.
+ * Otherwise, return the result of environment.$()
+ * Note: $$() is added in Hadoop 2.4.
+ */
+ def expandEnvironment(environment: Environment): String = {
--- End diff --
I don't know, the method name feels a little bit long. I'd be ok with just
`expand` (since the argument already tells you what's being expanded), but not
a big deal.
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