Github user pwendell commented on a diff in the pull request: https://github.com/apache/spark/pull/102#discussion_r10505246 --- Diff: yarn/common/src/main/scala/org/apache/spark/deploy/yarn/ClientBase.scala --- @@ -379,9 +381,48 @@ object ClientBase { // Based on code from org.apache.hadoop.mapreduce.v2.util.MRApps def populateHadoopClasspath(conf: Configuration, env: HashMap[String, String]) { - for (c <- conf.getStrings(YarnConfiguration.YARN_APPLICATION_CLASSPATH)) { + val classpathEntries = Option(conf.getStrings( + YarnConfiguration.YARN_APPLICATION_CLASSPATH)).getOrElse( + getDefaultYarnApplicationClasspath()) + for (c <- classpathEntries) { Apps.addToEnvironment(env, Environment.CLASSPATH.name, c.trim) } + + val mrClasspathEntries = Option(conf.getStrings( + "mapreduce.application.classpath")).getOrElse( + getDefaultMRApplicationClasspath()) + if (mrClasspathEntries != null) { + for (c <- mrClasspathEntries) { + Apps.addToEnvironment(env, Environment.CLASSPATH.name, c.trim) + } + } + } + + def getDefaultYarnApplicationClasspath(): Array[String] = { + try { + val field = classOf[MRJobConfig].getField("DEFAULT_YARN_APPLICATION_CLASSPATH") --- End diff -- Hey @sryza rather than use reflection here why not just modify the `Client.scala` classes in `common` and `stable`? I think the main reason of separating those two was so that we don't have to use reflection everywhere. Is that hard to do in this case?
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