Github user guoxiaolongzte commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18212#discussion_r120559076
  
    --- Diff: conf/spark-env.sh.template ---
    @@ -23,6 +23,7 @@
     # Options read when launching programs locally with
     # ./bin/run-example or ./bin/spark-submit
     # - HADOOP_CONF_DIR, to point Spark towards Hadoop configuration files
    +# - YARN_CONF_DIR, to point Spark towards YARN configuration files
    --- End diff --
    
    When you use ‘spark-submit --master yarn /home/...jar’  to submit the 
spark job, you need to set the YARN_CONF_DIR value.
    
    Can i modify it like this? as follows:
    +# - YARN_CONF_DIR, to point Spark towards YARN configuration files **when 
you use YARN.**


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