[SPARK-17465] [Spark Core] Inappropriate memory management in `org.apache.spark.storage.MemoryStore` may lead to memory leak#15022

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saturday-shi wants to merge 2 commits intoapache:branch-1.6from

saturday-shi:SPARK-17465

Commits on Sep 9, 2016

Correct the inappropriate memory management operation in releaseUnrollMemoryForThisTask and releasePendingUnrollMemoryForThisTask method.
Xing SHI
committed

Commits on Sep 10, 2016

Add call to releasePendingUnrollMemoryForThisTask at task completion for more robustness.
Xing SHI
committed