add comment in spark-env.sh.template for SPARK_JAVA_OPTS
Signed-off-by: shane-huang <shengsheng.huang@intel.com>
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@ -16,4 +16,9 @@
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# - SPARK_WORKER_PORT / SPARK_WORKER_WEBUI_PORT
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# - SPARK_WORKER_INSTANCES, to set the number of worker instances/processes
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# to be spawned on every slave machine
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# - SPARK_JAVA_OPTS, to set the jvm options for executor backend. Note: This is
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# only for node-specific options, whereas app-specific options should be set
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# in the application.
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# Examples of node-speicic options : -Dspark.local.dir, GC related options.
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# Examples of app-specific options : -Dspark.serializer
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