SPARK-1438 RDD.sample() make seed param optional#477

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Commits on Apr 21, 2014

SPARK-1438 RDD language apis to support optional seed in RDD methods sample/takeSample
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Commits on Apr 22, 2014

SPARK-1438 fix spacing issue
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Commits on Apr 23, 2014

SPARK-1438 RDD . Replace System.nanoTime with a Random generated number. python: use a separate instance of Random instead of seeding language api global Random instance.
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Commits on Apr 24, 2014