Github user lirui-intel commented on the pull request:
https://github.com/apache/spark/pull/892#issuecomment-45207806
I've revised the patch as @mateiz suggested: tasks will be added to
corresponding lists even when preferred location is unavailable, in which case
it'll also be added to pendingTasksWithNoPrefs. Later when new executor comes
up, pendingTasksWithNoPrefs is re-computed to remove tasks that have available
preferred locations.
I also added a "waiting for new executor" period. During that period, tasks
in pendingTasksWithNoPrefs will wait until we tried all other locality levels
(unless they really have no constraints). After this period, tasks left in
pendingTasksWithNoPrefs will be scheduled as PROCESS_LOCAL.
Please help to review this, thanks.
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