Github user WangTaoTheTonic commented on the pull request:
https://github.com/apache/spark/pull/3557#issuecomment-69430615
I am afraid it is not.
In cluster mode, in `SparkSubmitArguments.scala` will be assigned with
`mainClass` if `spark.app.name` or `--name` is not specified as it will not
read `SPARK_YARN_APP_NAME`.
Then in `SparkSubmit.scala` it will pass `args.name` in format of
`spark.app.name` and `--name` to `org.apache.spark.deploy.yarn.Client`.
`yarn.Client.scala` transform the args to a ClientArguments object, in
which `appName` will only get its value from `--name`.
So, in the progress, the app name would never get value from the env
`SPARK_YARN_APP_NAME`. It is only used in client mode.
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