diff --git a/docs/scala-programming-guide.md b/docs/scala-programming-guide.md index a07cd2e0a32a2..a9d7d87e231a6 100644 --- a/docs/scala-programming-guide.md +++ b/docs/scala-programming-guide.md @@ -189,7 +189,7 @@ The following tables list the transformations and actions currently supported (s groupByKey([numTasks]) When called on a dataset of (K, V) pairs, returns a dataset of (K, Seq[V]) pairs.
-Note: By default, this uses only 8 parallel tasks to do the grouping. You can pass an optional numTasks argument to set a different number of tasks. +Note: By default, if the RDD already has a partitioner, the task number is decided by the partition number of the partitioner, or else relies on the value of spark.default.parallelism if the property is set , otherwise depends on the partition number of the RDD. You can pass an optional numTasks argument to set a different number of tasks.