[SPARK-27338][Core] Fix deadlock in UnsafeExternalSorter.SpillableIterator when locking both UnsafeExternalSorter.SpillableIterator and TaskMemoryManager#24265

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venkata91 wants to merge 2 commits intoapache:masterfrom

venkata91:deadlock-sorter

Commits on Apr 1, 2019

Fix deadlock while freeing page
Venkata krishnan Sowrirajan
committed

Commits on Apr 3, 2019

Addressed review comments
Venkata krishnan Sowrirajan
committed