Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/22010#discussion_r220399123 --- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala --- @@ -42,7 +42,8 @@ import org.apache.spark.partial.GroupedCountEvaluator import org.apache.spark.partial.PartialResult import org.apache.spark.storage.{RDDBlockId, StorageLevel} import org.apache.spark.util.{BoundedPriorityQueue, Utils} -import org.apache.spark.util.collection.{OpenHashMap, Utils => collectionUtils} +import org.apache.spark.util.collection.{ExternalAppendOnlyMap, OpenHashMap, + Utils => collectionUtils} --- End diff -- nit: AFAIK we don't have length limit for import
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