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https://issues.apache.org/jira/browse/SPARK-31798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17114374#comment-17114374
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Apache Spark commented on SPARK-31798:
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User 'mccheah' has created a pull request for this issue:
https://github.com/apache/spark/pull/28616
> Return map output metadata from shuffle writers
> -----------------------------------------------
>
> Key: SPARK-31798
> URL: https://issues.apache.org/jira/browse/SPARK-31798
> Project: Spark
> Issue Type: Sub-task
> Components: Shuffle
> Affects Versions: 3.0.0
> Reporter: Matt Cheah
> Priority: Major
>
> Part of the overall sub-push for shuffle metadata management as proposed in[
> this
> document|[https://docs.google.com/document/d/1Aj6IyMsbS2sdIfHxLvIbHUNjHIWHTabfknIPoxOrTjk/edit]].
> The shuffle plugin system needs a means for storing custom metadata for
> shuffle readers to eventually use. This task tracks the API changes required
> for the map output writer to return some such metadata back to the driver.
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