Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/14602
I'm personally fine with "things break if you don't set app name", but
that's not the expectation set in the API:
```
/**
* Sets a name for the application, which will be shown in the Spark
web UI.
* If no application name is set, a randomly generated name will be
used.
*
* @since 2.0.0
*/
def appName(name: String): Builder = config("spark.app.name", name)
```
So technically that would be breaking the current API.
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