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package spark
import org.scalatest.FunSuite
class BroadcastSuite extends FunSuite with LocalSparkContext {
test("basic broadcast") {
sc = new SparkContext("local", "test")
val list = List(1, 2, 3, 4)
val listBroadcast = sc.broadcast(list)
val results = sc.parallelize(1 to 2).map(x => (x, listBroadcast.value.sum))
assert(results.collect.toSet === Set((1, 10), (2, 10)))
}
test("broadcast variables accessed in multiple threads") {
sc = new SparkContext("local[10]", "test")
val list = List(1, 2, 3, 4)
val listBroadcast = sc.broadcast(list)
val results = sc.parallelize(1 to 10).map(x => (x, listBroadcast.value.sum))
assert(results.collect.toSet === (1 to 10).map(x => (x, 10)).toSet)
}
}
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