xupefei commented on code in PR #45701:
URL: https://github.com/apache/spark/pull/45701#discussion_r1572148735
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connector/connect/client/jvm/src/main/scala/org/apache/spark/sql/SparkSession.scala:
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@@ -813,6 +823,28 @@ class SparkSession private[sql] (
* Set to false to prevent client.releaseSession on close() (testing only)
*/
private[sql] var releaseSessionOnClose = true
+
+ private[sql] def registerObservation(planId: Long, observation:
Observation): Unit = {
+ // makes this class thread-safe:
+ // only the first thread entering this block can set sparkSession
+ // all other threads will see the exception, as it is only allowed to do
this once
+ observation.synchronized {
+ if (observationRegistry.contains(planId)) {
+ throw new IllegalArgumentException("An Observation can be used with a
Dataset only once")
+ }
+ observationRegistry.put(planId, observation)
+ }
+ }
+
+ private[sql] def setMetricsAndUnregisterObservation(
+ planId: Long,
+ metrics: Option[Map[String, Any]]): Unit = {
+ observationRegistry.get(planId).map { observation =>
+ if (observation.setMetricsAndNotify(metrics)) {
+ observationRegistry.remove(planId)
Review Comment:
I had the same question when I looked at the code. In Spark Core we only
de-register the Observation when some non-empty metrics are set. I am not sure
under which circumstance the metrics can be empty.
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