Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/299#discussion_r11354857
--- Diff: conf/spark-env.sh.template ---
@@ -1,19 +1,36 @@
#!/usr/bin/env bash
-# This file contains environment variables required to run Spark. Copy it
as
-# spark-env.sh and edit that to configure Spark for your site.
-#
-# The following variables can be set in this file:
+# This file is sourced when running various Spark classes.
+# Copy it as spark-env.sh and edit that to configure Spark for your site.
+
+# Options read when launching programs locally with
+# ./bin/spark-example or ./bin/spark-submit
+# - SPARK_LOCAL_IP, to set the IP address Spark binds to on this node
+# - SPARK_PUBLIC_DNS, to set the public dns name of the driver program
+# - SPARK_CLASSPATH, default classpath entries to append
+
+# Options read by executors and drivers running inside the cluster
# - SPARK_LOCAL_IP, to set the IP address Spark binds to on this node
+# - SPARK_PUBLIC_DNS, to set the public DNS name of the driver program
--- End diff --
Looks like this is duplicated at the very end of the file.
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