Github user davies commented on a diff in the pull request: https://github.com/apache/spark/pull/10024#discussion_r60093876 --- Diff: core/src/main/scala/org/apache/spark/util/collection/ExternalSorter.scala --- @@ -235,6 +237,52 @@ private[spark] class ExternalSorter[K, V, C]( * @param collection whichever collection we're using (map or buffer) */ override protected[this] def spill(collection: WritablePartitionedPairCollection[K, C]): Unit = { + val inMemoryIterator = collection.destructiveSortedWritablePartitionedIterator(comparator) + val spillFile = spillMemoryIteratorToDisk(inMemoryIterator) + spills.append(spillFile) + } + + /** + * Force to spilling the current in-memory collection to disk to release memory, + * It will be called by TaskMemoryManager when there is not enough memory for the task. + */ + override protected[this] def forceSpill(): Boolean = { + if (isShuffleSort) { --- End diff -- This could be triggered by a different thread, so it should be thread safe.
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