Xiangrui Meng created SPARK-4398:
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             Summary: Specialize rdd.parallelize for xrange
                 Key: SPARK-4398
                 URL: https://issues.apache.org/jira/browse/SPARK-4398
             Project: Spark
          Issue Type: Improvement
          Components: PySpark
            Reporter: Xiangrui Meng
            Assignee: Xiangrui Meng


sc.parallelize(range) is slow, which writes to disk. We should specialize 
xrange for performance.



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