Github user sameeragarwal commented on a diff in the pull request:
https://github.com/apache/spark/pull/13318#discussion_r65629505
--- Diff:
core/src/main/java/org/apache/spark/shuffle/sort/ShuffleInMemorySorter.java ---
@@ -70,9 +70,14 @@ public int compare(PackedRecordPointer left,
PackedRecordPointer right) {
assert (initialSize > 0);
this.initialSize = initialSize;
this.useRadixSort = useRadixSort;
- this.memoryAllocationFactor = useRadixSort ? 2 : 1;
this.array = consumer.allocateArray(initialSize);
- this.sorter = new Sorter<>(ShuffleSortDataFormat.INSTANCE);
+ this.usableCapacity = calcCapacity();
+ }
+
+ private int calcCapacity() {
+ // Radix sort requires same amount of used memory as buffer, Tim sort
requires
+ // half of the used memory as buffer.
--- End diff --
by the way, out of curiosity, what's the worst case scenario in TimSort
that requires 0.5x more buffer space?
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