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https://issues.apache.org/jira/browse/SPARK-56410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18072182#comment-18072182
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Tengfei Huang commented on SPARK-56410:
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will open a PR soon.
> Add bounded k-way merge support in UnsafeExternalSorter
> -------------------------------------------------------
>
> Key: SPARK-56410
> URL: https://issues.apache.org/jira/browse/SPARK-56410
> Project: Spark
> Issue Type: Task
> Components: Spark Core, SQL
> Affects Versions: 4.1.1
> Reporter: Tengfei Huang
> Priority: Major
>
> Currently the UnsafeExternalSorter will merge all the spills at once which
> will need lots of memory, increases OOM risks for large jobs.
> Propose to add bounded k-way merge to remove the risk.
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