pan3793 commented on code in PR #47349:
URL: https://github.com/apache/spark/pull/47349#discussion_r1678971316


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala:
##########
@@ -641,14 +641,19 @@ object SQLConf {
     .checkValue(_ > 0, "The value of spark.sql.leafNodeDefaultParallelism must 
be positive.")
     .createOptional
 
+  // Lazily get the number of cores to make sure SparkContext created first.
+  private lazy val defaultShufflePartition: Option[Int] = 
SparkContext.getActive.flatMap { sc =>
+    if (sc.isLocal) Some(SparkContext.numDriverCores(sc.master)) else None

Review Comment:
   maybe numDriverCores * 2 or 3? in production practice, we usually expect a 
larger(2 or 3 times of available exec cores) parallelism of the stage to tackle 
uneven task runtimes



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