monkeyboy123 commented on code in PR #39102:
URL: https://github.com/apache/spark/pull/39102#discussion_r1052167027
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sql/core/src/main/scala/org/apache/spark/sql/internal/SharedState.scala:
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@@ -109,13 +109,18 @@ private[sql] class SharedState(
* A status store to query SQL status/metrics of this Spark application,
based on SQL-specific
* [[org.apache.spark.scheduler.SparkListenerEvent]]s.
*/
- val statusStore: SQLAppStatusStore = {
- val kvStore =
sparkContext.statusStore.store.asInstanceOf[ElementTrackingStore]
- val listener = new SQLAppStatusListener(conf, kvStore, live = true)
- sparkContext.listenerBus.addToStatusQueue(listener)
- val statusStore = new SQLAppStatusStore(kvStore, Some(listener))
- sparkContext.ui.foreach(new SQLTab(statusStore, _))
- statusStore
+ val statusStore: SQLAppStatusStore = SharedState.synchronized {
Review Comment:
code like this:
```
val spark = SparkSession.builder()
.config(sparkConf)
.getOrCreate()
setDefaultSession(null)
setActiveSession(null)
val spark2 = SparkSession.builder()
.config(sparkConf)
.getOrCreate()
```
in `getOrCreate` function,`new SparkSession(sparkContext, None, None,
extensions, options.toMap)` new SparkSession object will be created,so
sharedState will be created multiple times.
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