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https://issues.apache.org/jira/browse/SPARK-11307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14973564#comment-14973564
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Apache Spark commented on SPARK-11307:
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User 'JoshRosen' has created a pull request for this issue:
https://github.com/apache/spark/pull/9274
> Reduce memory consumption of OutputCommitCoordinator bookkeeping structures
> ---------------------------------------------------------------------------
>
> Key: SPARK-11307
> URL: https://issues.apache.org/jira/browse/SPARK-11307
> Project: Spark
> Issue Type: Bug
> Components: Scheduler
> Reporter: Josh Rosen
> Assignee: Josh Rosen
>
> OutputCommitCoordinator uses a map in a place where an array would suffice,
> increasing its memory consumption for result stages with millions of tasks.
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