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zsxwing edd3cd477c [SPARK-4715][Core] Make sure tryToAcquire won't return a negative value 
ShuffleMemoryManager.tryToAcquire may return a negative value. The unit test demonstrates this bug. It will output `0 did not equal -200 granted is negative`.

Author: zsxwing <zsxwing@gmail.com>

Closes #3575 from zsxwing/SPARK-4715 and squashes the following commits:

a193ae6 [zsxwing] Make sure tryToAcquire won't return a negative value
2014-12-03 12:19:40 -08:00
..
main [SPARK-4715][Core] Make sure tryToAcquire won't return a negative value 2014-12-03 12:19:40 -08:00
test [SPARK-4715][Core] Make sure tryToAcquire won't return a negative value 2014-12-03 12:19:40 -08:00