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https://issues.apache.org/jira/browse/SPARK-15466?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-15466:
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Assignee: (was: Apache Spark)
> Make `SparkSession` as the entry point to programming with RDD too
> ------------------------------------------------------------------
>
> Key: SPARK-15466
> URL: https://issues.apache.org/jira/browse/SPARK-15466
> Project: Spark
> Issue Type: Improvement
> Components: Examples, SQL
> Reporter: Dongjoon Hyun
>
> `SparkSession` greatly reduces the number of concepts which Spark users must
> know. Currently, `SparkSession` is defined as the entry point to programming
> Spark with the Dataset and DataFrame API. And, we can easily get `RDD` by
> calling `Dataset.rdd` or `DataFrame.rdd`, too.
> However, many usages (including examples) are observed to extract
> `SparkSession.sparkContext` and keep it as own variable to call `parallelize`.
> If `SparkSession` supports RDD seamlessly too, it would be great for
> usability. We can do this by simply adding `parallelize` API.
> **Example**
> {code:title=SparkPi.scala|borderStyle=solid}
> object SparkPi {
> def main(args: Array[String]) {
> val spark = SparkSession
> .builder
> .appName("Spark Pi")
> .getOrCreate()
> - val sc = spark.sparkContext
> val slices = if (args.length > 0) args(0).toInt else 2
> val n = math.min(100000L * slices, Int.MaxValue).toInt // avoid overflow
> - val count = sc.parallelize(1 until n, slices).map { i =>
> + val count = spark.parallelize(1 until n, slices).map { i =>
> val count = spark.parallelize(1 until n, slices).map { i =>
> val x = random * 2 - 1
> val y = random * 2 - 1
> if (x*x + y*y < 1) 1 else 0
> }.reduce(_ + _)
> println("Pi is roughly " + 4.0 * count / n)
> spark.stop()
> }
> }
> {code}
> {code:title=pi.py|borderStyle=solid}
> spark = SparkSession\
> .builder\
> .appName("PythonPi")\
> .getOrCreate()
> - sc = spark._sc
> -
> partitions = int(sys.argv[1]) if len(sys.argv) > 1 else 2
> n = 100000 * partitions
> def f(_):
> x = random() * 2 - 1
> y = random() * 2 - 1
> return 1 if x ** 2 + y ** 2 < 1 else 0
> -count = sc.parallelize(range(1, n + 1), partitions).map(f).reduce(add)
> count = spark.parallelize(range(1, n + 1), partitions).map(f).reduce(add)
> print("Pi is roughly %f" % (4.0 * count / n))
> spark.stop()
> {code}
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