cloud-fan commented on a change in pull request #33310:
URL: https://github.com/apache/spark/pull/33310#discussion_r673952383
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/OptimizeLocalShuffleReader.scala
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@@ -72,10 +72,24 @@ object OptimizeLocalShuffleReader extends
CustomShuffleReaderRule {
assert(numMappers > 0)
val numReducers = shuffleStage.shuffle.numPartitions
val expectedParallelism = advisoryParallelism.getOrElse(numReducers)
- val splitPoints = equallyDivide(numReducers, math.max(1,
expectedParallelism / numMappers))
- (0 until numMappers).flatMap { mapIndex =>
- (splitPoints :+ numReducers).sliding(2).map {
- case Seq(start, end) => PartialMapperPartitionSpec(mapIndex, start,
end)
+ val splitPoints = if (numMappers == 0) {
Review comment:
good point!
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