diff --git a/core/src/main/scala/org/apache/spark/api/java/JavaRDDLike.scala b/core/src/main/scala/org/apache/spark/api/java/JavaRDDLike.scala index 9e912d3adbb5e4ef7208420ac78fd019c28d5097..1d71875ed13af9303b7098018edd7232c1d37b05 100644 --- a/core/src/main/scala/org/apache/spark/api/java/JavaRDDLike.scala +++ b/core/src/main/scala/org/apache/spark/api/java/JavaRDDLike.scala @@ -26,7 +26,7 @@ import com.google.common.base.Optional import org.apache.hadoop.io.compress.CompressionCodec import org.apache.spark.{SparkContext, Partition, TaskContext} -import org.apache.spark.rdd.RDD +import org.apache.spark.rdd.{RDD, PartitionPruningRDD} import org.apache.spark.api.java.JavaPairRDD._ import org.apache.spark.api.java.function.{Function2 => JFunction2, Function => JFunction, _} import org.apache.spark.partial.{PartialResult, BoundedDouble} @@ -244,6 +244,15 @@ trait JavaRDDLike[T, This <: JavaRDDLike[T, This]] extends Serializable { new java.util.ArrayList(arr) } + /** + * Return an array that contains all of the elements in a specific partition of this RDD. + */ + def collectPartition(partitionId: Int): JList[T] = { + import scala.collection.JavaConversions._ + val partition = new PartitionPruningRDD[T](rdd, _ == partitionId) + new java.util.ArrayList(partition.collect().toSeq) + } + /** * Reduces the elements of this RDD using the specified commutative and associative binary operator. */ diff --git a/core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala b/core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala index a659cc06c2beee91ef40ac79bb6754948b68000b..ca42c769286e6532b3c8e74c09d4995656fdba1e 100644 --- a/core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala +++ b/core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala @@ -235,10 +235,6 @@ private[spark] object PythonRDD { file.close() } - def takePartition[T](rdd: RDD[T], partition: Int): Iterator[T] = { - implicit val cm : ClassTag[T] = rdd.elementClassTag - rdd.context.runJob(rdd, ((x: Iterator[T]) => x.toArray), Seq(partition), true).head.iterator - } } private class BytesToString extends org.apache.spark.api.java.function.Function[Array[Byte], String] { diff --git a/core/src/test/scala/org/apache/spark/JavaAPISuite.java b/core/src/test/scala/org/apache/spark/JavaAPISuite.java index 4234f6eac72f4cebd63232e7c2d33c2521805ce1..2862ed30197d89f7de1a13356729d499baebad98 100644 --- a/core/src/test/scala/org/apache/spark/JavaAPISuite.java +++ b/core/src/test/scala/org/apache/spark/JavaAPISuite.java @@ -897,4 +897,32 @@ public class JavaAPISuite implements Serializable { new Tuple2<Integer, Integer>(0, 4)), rdd3.collect()); } + + @Test + public void collectPartition() { + JavaRDD<Integer> rdd1 = sc.parallelize(Arrays.asList(1, 2, 3, 4, 5, 6, 7), 3); + + JavaPairRDD<Integer, Integer> rdd2 = rdd1.map(new PairFunction<Integer, Integer, Integer>() { + @Override + public Tuple2<Integer, Integer> call(Integer i) throws Exception { + return new Tuple2<Integer, Integer>(i, i % 2); + } + }); + + Assert.assertEquals(Arrays.asList(1, 2), rdd1.collectPartition(0)); + Assert.assertEquals(Arrays.asList(3, 4), rdd1.collectPartition(1)); + Assert.assertEquals(Arrays.asList(5, 6, 7), rdd1.collectPartition(2)); + + Assert.assertEquals(Arrays.asList(new Tuple2<Integer, Integer>(1, 1), + new Tuple2<Integer, Integer>(2, 0)), + rdd2.collectPartition(0)); + Assert.assertEquals(Arrays.asList(new Tuple2<Integer, Integer>(3, 1), + new Tuple2<Integer, Integer>(4, 0)), + rdd2.collectPartition(1)); + Assert.assertEquals(Arrays.asList(new Tuple2<Integer, Integer>(5, 1), + new Tuple2<Integer, Integer>(6, 0), + new Tuple2<Integer, Integer>(7, 1)), + rdd2.collectPartition(2)); + } + } diff --git a/python/pyspark/context.py b/python/pyspark/context.py index cbd41e58c4a780392b2a6b8c58320535e416cd36..0604f6836ca42b3b99cd44a19af0e55fc68415a2 100644 --- a/python/pyspark/context.py +++ b/python/pyspark/context.py @@ -43,7 +43,6 @@ class SparkContext(object): _gateway = None _jvm = None _writeToFile = None - _takePartition = None _next_accum_id = 0 _active_spark_context = None _lock = Lock() @@ -134,8 +133,6 @@ class SparkContext(object): SparkContext._jvm = SparkContext._gateway.jvm SparkContext._writeToFile = \ SparkContext._jvm.PythonRDD.writeToFile - SparkContext._takePartition = \ - SparkContext._jvm.PythonRDD.takePartition if instance: if SparkContext._active_spark_context and SparkContext._active_spark_context != instance: diff --git a/python/pyspark/rdd.py b/python/pyspark/rdd.py index 61720dcf1af9d4614f2bc7902efb2b2c93af1b40..d81b7c90c1336148835fa41ed220be8f8ac42f8a 100644 --- a/python/pyspark/rdd.py +++ b/python/pyspark/rdd.py @@ -577,7 +577,7 @@ class RDD(object): mapped = self.mapPartitions(takeUpToNum) items = [] for partition in range(mapped._jrdd.splits().size()): - iterator = self.ctx._takePartition(mapped._jrdd.rdd(), partition) + iterator = mapped._jrdd.collectPartition(partition).iterator() items.extend(mapped._collect_iterator_through_file(iterator)) if len(items) >= num: break