Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/3943#discussion_r23246057
--- 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 = {
+ var result = environment.$()
+
+ // We use reflection in order not to fail building with Hadoop 2.3 or
before.
+ val clazz = classOf[Environment]
+ val name = "$$"
+ if (clazz.getMethods().exists(_.getName == name)){
+ val method = clazz.getMethod(name)
+ result = method.invoke(environment).asInstanceOf[String]
+ }
+
+ result
+ }
+
+ /**
+ * Get class path separator using Yarn API.
+ * If ApplicationConstants.CLASS_PATH_SEPARATOR is implemented, return
it.
+ * Otherwise, return File.pathSeparator
+ * Note: File.pathSeparator is added in Hadoop 2.4.
+ */
+ def getClassPathSeparator(): String = {
+ var result = File.pathSeparator
+
+ // We use reflection in order not to fail building with Hadoop 2.3 or
before.
+ val clazz = classOf[ApplicationConstants]
+ val name = "CLASS_PATH_SEPARATOR"
+ if (clazz.getFields().exists(_.getName == name)){
--- End diff --
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