uros-b commented on code in PR #56804:
URL: https://github.com/apache/spark/pull/56804#discussion_r3479727902
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core/src/main/scala/org/apache/spark/internal/config/package.scala:
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@@ -1965,6 +1965,17 @@ package object config {
"The merge factor must be -1 (disabled) or at least 2.")
.createWithDefault(-1)
+ private[spark] val UNSAFE_SORTER_SPILL_MERGER_USE_LOSER_TREE =
+ ConfigBuilder("spark.unsafe.sorter.spill.merger.useLoserTree")
+ .internal()
+ .doc("If true, use a loser tree based k-way merger when reading multiple
spill files " +
+ "in UnsafeExternalSorter; otherwise use the original priority-queue
based merger. " +
+ "Loser tree performs one comparison per replay versus two for heap
sift-down, which " +
+ "can be faster when there are many spills.")
+ .version("4.1.0")
Review Comment:
```suggestion
.version("4.3.0")
```
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