cloud-fan commented on a change in pull request #23438:
[SPARK-26525][SHUFFLE]Fast release ShuffleBlockFetcherIterator on completion of
the iteration
URL: https://github.com/apache/spark/pull/23438#discussion_r252919017
##########
File path:
core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala
##########
@@ -509,6 +511,11 @@ final class ShuffleBlockFetcherIterator(
(currentResult.blockId, new BufferReleasingInputStream(input, this))
}
+ def toCompletionIterator: Iterator[(BlockId, InputStream)] = {
+ CompletionIterator[(BlockId, InputStream), this.type](this,
Review comment:
In CoaleaseRDD, a task reads many iterators. So when one iterator exhausted,
the task may still have many more iterators to consume.
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