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https://issues.apache.org/jira/browse/SPARK-48391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun closed SPARK-48391.
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> use addAll instead of add function in TaskMetrics to accelerate
> -----------------------------------------------------------------
>
> Key: SPARK-48391
> URL: https://issues.apache.org/jira/browse/SPARK-48391
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 3.5.0, 3.5.1
> Reporter: jiahong.li
> Assignee: jiahong.li
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.5.2, 4.0.0
>
>
> In the fromAccumulators method of TaskMetrics，we should use `
> tm._externalAccums.addAll` instead of `tm._externalAccums.add`, as
> _externalAccums is a instance of CopyOnWriteArrayList
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