The app ID is assigned internally by spark's task scheduler https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/scheduler/TaskScheduler.scala#L35. You could probably change the naming, however I'm pretty sure that the ID will always have to be unique for a context on a cluster. Alternatively, could setting the name (conf.setAppName or via "spark.app.name" config) help with what you're trying to achieve?
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