maropu commented on a change in pull request #24113: [MINOR][CORE] Replace 
Scala forkjoin package to Java bundled one
URL: https://github.com/apache/spark/pull/24113#discussion_r266220497
 
 

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 File path: core/src/main/scala/org/apache/spark/rdd/UnionRDD.scala
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 @@ -18,10 +18,10 @@
 package org.apache.spark.rdd
 
 import java.io.{IOException, ObjectOutputStream}
+import java.util.concurrent.ForkJoinPool
 
 import scala.collection.mutable.ArrayBuffer
 import scala.collection.parallel.ForkJoinTaskSupport
-import scala.concurrent.forkjoin.ForkJoinPool
 import scala.reflect.ClassTag
 
 Review comment:
   We cannot use `ThreadUtils.newForkJoinPool` in this class instead of 
`ForkJoinPool` directly?

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