Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/3943#discussion_r23904691
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnSparkHadoopUtil.scala ---
@@ -186,4 +189,30 @@ 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.
+ */
+ private lazy val expandMethod =
+ Try(classOf[Environment].getMethod("$$"))
+ .getOrElse(classOf[Environment].getMethod("$"))
+
+ def expandEnvironment(environment: Environment): String =
+ expandMethod.invoke(environment).asInstanceOf[String]
+
+ /**
+ * 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.
--- End diff --
what does this mean? do you mean the CLASS_PATH_SEPARATOR is added in
Hadoop 2.4? (File belongs to `java.io.File`, does't it?)
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