ChenjunZou commented on a change in pull request #23083: [SPARK-26114][CORE] ExternalSorter's readingIterator field leak URL: https://github.com/apache/spark/pull/23083#discussion_r312770904
########## File path: core/src/main/scala/org/apache/spark/util/CompletionIterator.scala ########## @@ -25,11 +25,14 @@ private[spark] abstract class CompletionIterator[ +A, +I <: Iterator[A]](sub: I) extends Iterator[A] { private[this] var completed = false - def next(): A = sub.next() + private[this] var iter = sub + def next(): A = iter.next() def hasNext: Boolean = { - val r = sub.hasNext + val r = iter.hasNext if (!r && !completed) { completed = true + // reassign to release resources of highly resource consuming iterators early + iter = Iterator.empty.asInstanceOf[I] Review comment: Thanks, szhem :) your UT explains all. at first I misunderstand sub as CompletionIterator(val sub) Hided, well done! ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org