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https://issues.apache.org/jira/browse/SPARK-40950?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mridul Muralidharan resolved SPARK-40950.
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Fix Version/s: 3.4.0
Resolution: Fixed
Issue resolved by pull request 38427
[https://github.com/apache/spark/pull/38427]
> isRemoteAddressMaxedOut performance overhead on scala 2.13
> ----------------------------------------------------------
>
> Key: SPARK-40950
> URL: https://issues.apache.org/jira/browse/SPARK-40950
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 3.2.2, 3.3.1
> Reporter: Emil Ejbyfeldt
> Assignee: Emil Ejbyfeldt
> Priority: Major
> Fix For: 3.4.0
>
>
> On scala 2.13 the blocks in FetchRequest is sometimes backed by a `List`
> while in 2.12 it would be ArrayBuffer. This means that calculating the length
> of the blocks which is done in isRemoteAddressMaxedOut and other places now
> much more expensive. This is because in 2.13 `Seq` is can no longer be
> backed by a mutable collection.
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