The default value of "spark.storage.memoryFraction" has been changed from 0.66 to 0.6 . So it should be 60% of the memory to cache while 40% used for task execution.

Author: Chen Chao <crazyjvm@gmail.com>

Closes #66 from CrazyJvm/master and squashes the following commits:

0f84d86 [Chen Chao] update proportion of memory