Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2409#issuecomment-68009895
It looks like there are two sort-of-unrelated changes in this PR:
- Don't perform the expensive `HadoopRDD.getPartitions()` call inside of
DAGScheduler, since this blocks the scheduling of other jobs / tasks.
- Don't start the task scheduler until the first task is submitted.
I think that we should handle these in separate JIRAs / PRs.
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