[WIP][SPARK-18886][CORE] Make locality wait time be the time since a TSM's available slots were fully utilized#26696

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bmarcott wants to merge 4 commits intoapache:masterfrom

bmarcott:nmarcott-fulfill-slots

Commits on Nov 27, 2019

utilize scheduable interface for delay scheduling
bmarcott
committed

Commits on Dec 9, 2019

update total number of slots incrementally
bmarcott
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Commits on Dec 17, 2019

only allocate as many slots as remaining tasks
bmarcott
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Commits on Dec 19, 2019

eliminate unnecessary threadsafe queue and shortcut on 0 slots in Pool.updateAvailableSlots
bmarcott
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