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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