amaliujia commented on code in PR #47171:
URL: https://github.com/apache/spark/pull/47171#discussion_r1663461576
##########
core/src/main/scala/org/apache/spark/internal/config/package.scala:
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@@ -42,6 +42,18 @@ package object config {
private[spark] val SPARK_TASK_PREFIX = "spark.task"
private[spark] val LISTENER_BUS_EVENT_QUEUE_PREFIX =
"spark.scheduler.listenerbus.eventqueue"
+ private[spark] val DEFAULT_PARALLELISM =
+ ConfigBuilder("spark.default.parallelism")
+ .doc("Default number of partitions in RDDs returned by transformations
like " +
+ "join, reduceByKey, and parallelize when not set by user. " +
+ "For distributed shuffle operations like reduceByKey and join, the
largest number of " +
+ "partitions in a parent RDD. For operations like parallelize with no
parent RDDs, " +
+ "it depends on the cluster manager. For example in Local mode, it
defaults to the " +
+ "number of cores on the local machine")
Review Comment:
This is something I am not sure. @cloud-fan do you remember?
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