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[SPARK-1680] [Docs] Explain environment variables for running on YARN in cluster mode #10869

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[SPARK-1680] [Docs] Explain environment variables for running on YARN in cluster mode #10869

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Added explanation of how to set environment variables when running Sp…
weineran Jan 21, 2016
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replaced code with back-ticks, added back-ticks around `cluster`
weineran Jan 26, 2016
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2 changes: 2 additions & 0 deletions docs/configuration.md
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Expand Up @@ -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 `spark.yarn.appMasterEnv.[EnvironmentVariableName]` 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.

# Configuring Logging

Spark uses [log4j](http://logging.apache.org/log4j/) for logging. You can configure it by adding a
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