Github user tgravescs commented on a diff in the pull request: https://github.com/apache/spark/pull/33#discussion_r10361820 --- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala --- @@ -135,6 +135,8 @@ class SparkContext( val isLocal = (master == "local" || master.startsWith("local[")) + if (master == "yarn-client") System.setProperty("SPARK_YARN_MODE", "true") --- End diff -- Normally they shouldn't have to. If the user does certain things in their code (access SparkHadoopUtil before creating the SparkContext) and are using yarn-client mode they might have to. I pointed that out in the jira I filed. I think we should see if we can fix that.
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