[SPARK-9144] Remove DAGScheduler.runLocallyWithinThread and spark.localExecution.enabled #7585
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Spark has an option called spark.localExecution.enabled; according to the docs:
This feature ends up adding quite a bit of complexity to DAGScheduler, especially in the runLocallyWithinThread method, but as far as I know nobody uses this feature (I searched the mailing list and haven't seen any recent mentions of the configuration nor stacktraces including the runLocally method). As a step towards scheduler complexity reduction, I propose that we remove this feature and all code related to it for Spark 1.5.
This pull request simply brings #7484 up to date.