[SPARK-17759] [CORE] Avoid adding duplicate schedulables#15326

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erenavsarogullari wants to merge 5 commits intoapache:masterfrom erenavsarogullari:SPARK-17759

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Commits on Jun 1, 2019

SchedulableBuilder should avoid to create duplicate fair scheduler-pools.

erenavsarogullari
authored and
Eren Avsarogullari
committed
FairSchedulableBuilder should avoid to create duplicate schedulable.

erenavsarogullari
authored and
Eren Avsarogullari
committed
Review comments are addressed.

erenavsarogullari
authored and
Eren Avsarogullari
committed
Review comments are addressed.

erenavsarogullari
authored and
Eren Avsarogullari
committed
Review comments are addressed and merge conflict has been fixed.
Eren Avsarogullari
committed