liupc 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_r251747164
##########
File path:
core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala
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@@ -219,6 +221,10 @@ final class ShuffleBlockFetcherIterator(
logWarning("Failed to cleanup shuffle fetch temp file " + file.path())
}
}
+ // Null out the referent in cleanup listener to make sure we don't keep a
reference
+ // to this ShuffleBlockFetcherIterator, after we're done reading from it,
to let it be
Review comment:
@cloud-fan it's here
> Otherwise we can metadata on block locations
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