Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/9241#discussion_r43460497
--- Diff:
core/src/main/java/org/apache/spark/util/collection/unsafe/sort/UnsafeInMemorySorter.java
---
@@ -83,37 +83,43 @@ public UnsafeInMemorySorter(
final PrefixComparator prefixComparator,
int initialSize) {
assert (initialSize > 0);
- this.pointerArray = new long[initialSize * 2];
+ this.array = new long[initialSize * 2];
this.memoryManager = memoryManager;
this.sorter = new Sorter<>(UnsafeSortDataFormat.INSTANCE);
this.sortComparator = new SortComparator(recordComparator,
prefixComparator, memoryManager);
}
+ public void reset() {
+ pos = 0;
+ }
+
/**
* @return the number of records that have been inserted into this
sorter.
*/
public int numRecords() {
- return pointerArrayInsertPosition / 2;
+ return pos / 2;
}
- public long getMemoryUsage() {
- return pointerArray.length * 8L;
+ private int newLength() {
+ return array.length < Integer.MAX_VALUE / 2 ? (array.length * 2) :
Integer.MAX_VALUE;
+ }
+
+ public long getMemoryToExpand() {
+ return (long) (newLength() - array.length) * 8L;
--- End diff --
We already acquire the whole memory for new array first, then release the
memory for old one.
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