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https://issues.apache.org/jira/browse/SPARK-37315?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun resolved SPARK-37315.
-----------------------------------
Fix Version/s: 3.3.0
Resolution: Fixed
Issue resolved by pull request 34583
[https://github.com/apache/spark/pull/34583]
> Mitigate ConcurrentModificationException thrown from a test in MLEventSuite
> ---------------------------------------------------------------------------
>
> Key: SPARK-37315
> URL: https://issues.apache.org/jira/browse/SPARK-37315
> Project: Spark
> Issue Type: Bug
> Components: ML, Tests
> Affects Versions: 3.3.0
> Reporter: Kousuke Saruta
> Assignee: Kousuke Saruta
> Priority: Major
> Fix For: 3.3.0
>
>
> Recently, I notice ConcurrentModificationException is sometimes thrown from
> the following part of the test "pipeline read/write events" in MLEventSuite
> when Scala 2.13 is used.
> {code}
> events.map(JsonProtocol.sparkEventToJson).foreach { event =>
> assert(JsonProtocol.sparkEventFromJson(event).isInstanceOf[MLEvent])
> }
> {code}
> I think the root cause is the ArrayBuffer (events) is updated asynchronously
> by the following part.
> {code}
> private val listener: SparkListener = new SparkListener {
> override def onOtherEvent(event: SparkListenerEvent): Unit = event match {
> case e: MLEvent => events.append(e)
> case _ =>
> }
> }
> {code}
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