[WIP] Spark-1392: Add parameter to reserve minimum memory for the system and increase default executor memory#377

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patmcdonough wants to merge 3 commits intoapache:masterfrom

patmcdonough:reserved-memory

Commits on Apr 10, 2014

Addeded a new parameter, spark.system.reservedMemorySize to reserve a portion of the heap for system objects, especilaly in the case of smaller heaps (like the out of the box conifuration for the s…
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Increase the default for spark.executor.memory to 1g
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Commits on Apr 11, 2014

Updating styles and docs per suggestions in the PR
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