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[SPARK-17396][core] Share the task support between UnionRDD instances. #14985

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[SPARK-17396][core] Share the task support between UnionRDD instances. #14985

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12 changes: 7 additions & 5 deletions core/src/main/scala/org/apache/spark/rdd/UnionRDD.scala
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Expand Up @@ -20,7 +20,7 @@ package org.apache.spark.rdd
import java.io.{IOException, ObjectOutputStream}

import scala.collection.mutable.ArrayBuffer
import scala.collection.parallel.ForkJoinTaskSupport
import scala.collection.parallel.{ForkJoinTaskSupport, ThreadPoolTaskSupport}
import scala.concurrent.forkjoin.ForkJoinPool
import scala.reflect.ClassTag

Expand Down Expand Up @@ -58,6 +58,11 @@ private[spark] class UnionPartition[T: ClassTag](
}
}

object UnionRDD {
private[spark] lazy val partitionEvalTaskSupport =
new ForkJoinTaskSupport(new ForkJoinPool(8))
}

@DeveloperApi
class UnionRDD[T: ClassTag](
sc: SparkContext,
Expand All @@ -68,13 +73,10 @@ class UnionRDD[T: ClassTag](
private[spark] val isPartitionListingParallel: Boolean =
rdds.length > conf.getInt("spark.rdd.parallelListingThreshold", 10)

@transient private lazy val partitionEvalTaskSupport =
new ForkJoinTaskSupport(new ForkJoinPool(8))

override def getPartitions: Array[Partition] = {
val parRDDs = if (isPartitionListingParallel) {
val parArray = rdds.par
parArray.tasksupport = partitionEvalTaskSupport
parArray.tasksupport = UnionRDD.partitionEvalTaskSupport
parArray
} else {
rdds
Expand Down