Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/10869#discussion_r50672127
--- Diff: docs/configuration.md ---
@@ -1700,6 +1700,8 @@ to use on each machine and maximum memory.
Since `spark-env.sh` is a shell script, some of these can be set
programmatically -- for example, you might
compute `SPARK_LOCAL_IP` by looking up the IP of a specific network
interface.
+Note: When running Spark on YARN in cluster mode, environment variables
need to be set using the
<code>spark.yarn.appMasterEnv.[EnvironmentVariableName]</code> property in your
`conf/spark-defaults.conf` file. Environment variables that are set in
`spark-env.sh` will not be reflected in the YARN Application Master process in
cluster mode. See the [YARN-related Spark
Properties](running-on-yarn.html#spark-properties) for more information.
--- End diff --
Nit -- this needs back-ticks rather than `<code>` right? I think it's OK.
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