Github user lirui-intel commented on the pull request: https://github.com/apache/spark/pull/892#issuecomment-45175085 Yes @mateiz great idea. One quick question is that tasks in pendingTasksWithNoPrefs are considered as PROCESS_LOCAL. Suppose we have no tasks in pendingTasksForExecutor, but some tasks in pendingTasksForHost which are NODE_LOCAL. And also some tasks in pendingTasksWithNoPrefs whose preferred locations are not available. Now if the current allowed locality is PROCESS_LOCAL, TaskSetManager will pick tasks from pendingTasksWithNoPrefs rather than pendingTasksForHost.
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