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This test ensures that when there are no alive executors that satisfy a particular locality level, the TaskSetManager doesn't ever use that as the maximum allowed locality level (this optimization ensures that a job doesn't wait extra time in an attempt to satisfy a scheduling locality level that is impossible). @mateiz and @lirui-intel this unit test illustrates an issue with apache#892 (it fails with that patch). Author: Kay Ousterhout <kayousterhout@gmail.com> Closes apache#1024 from kayousterhout/scheduler_unit_test and squashes the following commits: de6a08f [Kay Ousterhout] Added a TaskSetManager unit test.
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