Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18536#discussion_r125578355
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SparkSession.scala
---
@@ -912,21 +912,16 @@ object SparkSession {
// No active nor global default session. Create a new one.
val sparkContext = userSuppliedContext.getOrElse {
- // set app name if not given
- val randomAppName = java.util.UUID.randomUUID().toString
val sparkConf = new SparkConf()
options.foreach { case (k, v) => sparkConf.set(k, v) }
+
+ // set a random app name if not given.
if (!sparkConf.contains("spark.app.name")) {
- sparkConf.setAppName(randomAppName)
- }
- val sc = SparkContext.getOrCreate(sparkConf)
- // maybe this is an existing SparkContext, update its SparkConf
which maybe used
- // by SparkSession
- options.foreach { case (k, v) => sc.conf.set(k, v) }
- if (!sc.conf.contains("spark.app.name")) {
- sc.conf.setAppName(randomAppName)
+ sparkConf.setAppName(java.util.UUID.randomUUID().toString)
}
- sc
+
+ SparkContext.getOrCreate(sparkConf)
+ // Do not update `SparkConf` for existing `SparkContext`, as
it's shared by all sessions.
--- End diff --
I think that document is for normal cases, we won't set conf for existing
`SparkSession`, and we have warning log if an existing
`SparkSession`/`SparkContext` is detected.
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