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This commit randomizes the order of resource offers to avoid scheduling all tasks on the same small set of machines. This is a much simpler solution to SPARK-979 than apache#7. Author: Kay Ousterhout <[email protected]> Closes apache#27 from kayousterhout/randomize and squashes the following commits: 435d817 [Kay Ousterhout] [SPARK-979] Randomize order of offers. Conflicts: core/src/main/scala/org/apache/spark/scheduler/TaskSchedulerImpl.scala core/src/test/scala/org/apache/spark/scheduler/ClusterSchedulerSuite.scala core/src/test/scala/org/apache/spark/scheduler/TaskSetManagerSuite.scala
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