Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/1528#issuecomment-50106263
We shouldn't should expose these types of hooks into the scheduler
internals. The TaskSet, for instance, is an implementation detail we don't want
to be part of a public API and the priority is an internal concept.
The public API of Spark for scheduling policies is the Fair Scheduler. Many
different types of policies can be achieved within Fair Scheduling, including
having a high priority pool to which tasks are submitted.
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