Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/9132#discussion_r42172849
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/ui/SQLListener.scala ---
@@ -126,7 +126,13 @@ private[sql] class SQLListener(conf: SparkConf)
extends SparkListener with Loggi
val stageId = stageSubmitted.stageInfo.stageId
val stageAttemptId = stageSubmitted.stageInfo.attemptId
// Always override metrics for old stage attempt
- _stageIdToStageMetrics(stageId) = new SQLStageMetrics(stageAttemptId)
+ if (_stageIdToStageMetrics.contains(stageId)) {
+ _stageIdToStageMetrics(stageId) = new SQLStageMetrics(stageAttemptId)
+ } else {
+ // If a stage belongs to some SQL execution, its stageId will be put
in "onJobStart".
+ // Since "_stageIdToStageMetrics" doesn't contain it, it must not
belong to any SQL execution.
+ // So we can ignore it.
--- End diff --
in which case we will have such a stage ID that doesn't belong to any SQL
execution?
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