yaooqinn commented on a change in pull request #33172:
URL: https://github.com/apache/spark/pull/33172#discussion_r662141208
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/ShufflePartitionsUtil.scala
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@@ -61,7 +63,9 @@ object ShufflePartitionsUtil extends Logging {
// `maxTargetSize` from being set to 0.
val maxTargetSize = math.max(
math.ceil(totalPostShuffleInputSize / minNumPartitions.toDouble).toLong,
16)
- val targetSize = math.min(maxTargetSize, advisoryTargetSize)
+ // The target size can be very small if minNumPartitions is super big.
Here we use
+ // minPartitionSize as the lower bound to avoid too small partitions after
coalescing.
+ val targetSize = math.max(math.min(maxTargetSize, advisoryTargetSize),
minPartitionSize)
val shuffleIds =
mapOutputStatistics.flatMap(_.map(_.shuffleId)).mkString(", ")
logInfo(s"For shuffle($shuffleIds), advisory target size:
$advisoryTargetSize, " +
Review comment:
shall we mention the minPartitionSize here?
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