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https://issues.apache.org/jira/browse/SPARK-57371?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-57371:
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Labels: pull-request-available (was: )
> Fix thread-unsafe Scala reflection race in ArrowDeserializers.resolveCompanion
> ------------------------------------------------------------------------------
>
> Key: SPARK-57371
> URL: https://issues.apache.org/jira/browse/SPARK-57371
> Project: Spark
> Issue Type: Bug
> Components: Connect
> Affects Versions: 4.3.0
> Reporter: Haiyang Sun
> Priority: Major
> Labels: pull-request-available
>
> Fixes a thread-safety race condition in ArrowDeserializers.resolveCompanion()
> that causes `ScalaReflectionException: <none> is not a module` when used
> concurrently.
> Scala runtime reflection is not thread-safe (scala/bug#6240, #10431). The
> resolveCompanion method calls `mirror.classSymbol(...).companion.asModule`
> without synchronization. Under concurrent access - companion can race and
> return NoSymbol, causing `.asModule` to throw. The same issue affects
> `ScalaEnumEncoder` deserialization.
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