[jira] [Commented] (SPARK-37315) Mitigate a ConcurrentModificationException thrown from a test in MLEventSuite

["Apache Spark (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-37315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17443127#comment-17443127 ] 

Apache Spark commented on SPARK-37315:
--------------------------------------

User 'sarutak' has created a pull request for this issue:
https://github.com/apache/spark/pull/34583

> Mitigate a 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
>
> 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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