[SPARK-36377][DOCS] Re-document "Options read in YARN client/cluster mode" section in spark-env.sh.template
### What changes were proposed in this pull request? Edit spark-env.sh.template for better documentation. ### Why are the changes needed? Some options (e.g. SPARK_CONF_DIR, SPARK_EXECUTOR_CORES, etc.) are read by any mode but are in the "Options read in YARN client/cluster mode" that might confuse users, so we should separate YARN only options from others. ### Does this PR introduce _any_ user-facing change? Yes, docs changed. ### How was this patch tested? Just a manual checking. <img width="336" alt="options" src="https://user-images.githubusercontent.com/87687356/127804872-02a27337-f304-47df-affa-a8c4e9e98fe5.png"> Closes #33604 from yutoacts/SPARK-36377. Authored-by: Yuto Akutsu <yuto.akutsu@nttdata.com> Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>
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# - SPARK_LOCAL_DIRS, storage directories to use on this node for shuffle and RDD data
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# - MESOS_NATIVE_JAVA_LIBRARY, to point to your libmesos.so if you use Mesos
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# Options read in YARN client/cluster mode
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# Options read in any mode
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# - SPARK_CONF_DIR, Alternate conf dir. (Default: ${SPARK_HOME}/conf)
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# - HADOOP_CONF_DIR, to point Spark towards Hadoop configuration files
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# - YARN_CONF_DIR, to point Spark towards YARN configuration files when you use YARN
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# - SPARK_EXECUTOR_CORES, Number of cores for the executors (Default: 1).
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# - SPARK_EXECUTOR_MEMORY, Memory per Executor (e.g. 1000M, 2G) (Default: 1G)
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# - SPARK_DRIVER_MEMORY, Memory for Driver (e.g. 1000M, 2G) (Default: 1G)
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# Options read in any cluster manager using HDFS
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# - HADOOP_CONF_DIR, to point Spark towards Hadoop configuration files
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# Options read in YARN client/cluster mode
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# - YARN_CONF_DIR, to point Spark towards YARN configuration files when you use YARN
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# Options for the daemons used in the standalone deploy mode
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# - SPARK_MASTER_HOST, to bind the master to a different IP address or hostname
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# - SPARK_MASTER_PORT / SPARK_MASTER_WEBUI_PORT, to use non-default ports for the master
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