Github user ehnalis commented on the pull request:
https://github.com/apache/spark/pull/6671#issuecomment-109789397
@andrewor14 Currently the only place where you can set the name of your
application is when you prepare an `ApplicationSubmissionContext` (YARN API)
and you set the application name before submitting with `YarnClient`. This is
what `org.apache.spark.deploy.yarn.Client` does. The problem is that the name
of the Spark application has been set with `SparkContext.setAppName` usually in
the user code (JAR) you wish to deploy to the cluster. When `SparkContext`
wakes up on YARN as the AM process on `container 0`, your application already
has an ID and a name, which you are not able to change as AM, neither as the
client who submitted the application.
Check https://issues.apache.org/jira/browse/YARN-3772
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