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https://issues.apache.org/jira/browse/SPARK-34934?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-34934:
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Assignee: Apache Spark
> Race condition while registering source in MetricsSystem
> ---------------------------------------------------------
>
> Key: SPARK-34934
> URL: https://issues.apache.org/jira/browse/SPARK-34934
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.3.2, 3.1.1
> Reporter: Harsh Panchal
> Assignee: Apache Spark
> Priority: Minor
>
> {{MetricsSystem}} manages {{mutable.ArrayBuffer}} of metric sources.
> {{registerSource}} and {{removeSource}} methods are provided to add/remove
> new source from Metric system. Both these methods are not synchronised. Also,
> underlying {{mutable.ArrayBuffer}} not being thread safe, unexpected
> behaviours are possible if called concurrently (in our case, multiple
> executors registering custom source).
> For ex, we got below exception due to race condition
> {noformat}
> java.lang.ArrayIndexOutOfBoundsException
> at
> scala.collection.mutable.ResizableArray$class.ensureSize(ResizableArray.scala:104)
> at scala.collection.mutable.ArrayBuffer.ensureSize(ArrayBuffer.scala:48)
> at scala.collection.mutable.ArrayBuffer.$plus$eq(ArrayBuffer.scala:84)
> at
> org.apache.spark.metrics.MetricsSystem.registerSource(MetricsSystem.scala:157)
> {noformat}
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