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https://issues.apache.org/jira/browse/SPARK-38867?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-38867:
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Assignee: Apache Spark
> Avoid OOM when bufferedPlan has a lot of duplicate keys in SortMergeJoin
> codegen
> --------------------------------------------------------------------------------
>
> Key: SPARK-38867
> URL: https://issues.apache.org/jira/browse/SPARK-38867
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.2.1
> Reporter: mcdull_zhang
> Assignee: Apache Spark
> Priority: Minor
>
> WholeStageCodegenExec is wrapped in BufferedRowIterator.
> BufferedRowIterator uses a LinkedList to hold the output of
> WholeStageCodegenExec.
> When the parent of SortMergeJoin cannot codegen, SortMergeJoin needs to
> append the output to this LinkedList.
> SortMergeJoin processes a record in streamedPlan each time. If all records in
> bufferedPlan can match this record, all records in bufferedPlan will be saved
> in LinkedList, resulting in OOM.
> The above situation is very common in our internal use, so it is best to add
> a configuration to the codegen code. If there are enough pieces in the
> LinkedList, stop SortMergeJoin and let the parent consume it first.
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