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https://issues.apache.org/jira/browse/SPARK-52923?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mridul Muralidharan reassigned SPARK-52923:
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Assignee: gaoyajun02
> Allow ShuffleManager to control push merge during shuffle registration
> ----------------------------------------------------------------------
>
> Key: SPARK-52923
> URL: https://issues.apache.org/jira/browse/SPARK-52923
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle
> Affects Versions: 3.5.0, 4.0.0
> Reporter: gaoyajun02
> Assignee: gaoyajun02
> Priority: Minor
> Labels: pull-request-available
>
> Background:
> While `spark.shuffle.push.enabled` provides global control over push-based
> shuffle, there are scenarios requiring more granular control:
> - Mass job migration scenarios where different jobs may need different
> shuffle strategies
> - Remote shuffle managers need shuffle-level fallback capabilities to
> push-based shuffle
> - Dynamic decision making based on shuffle characteristics during shuffle
> registration
>
> Currently, the _shuffleMergeAllowed flag in ShuffleDependency is initialized
> before shuffle registration, preventing ShuffleManager implementations from
> modifying this capability based on their specific requirements or runtime
> conditions.
>
> This change moves the initialization of numPartitions and
> _shuffleMergeAllowed before the shuffleManager.registerShuffle() call,
> allowing ShuffleManager implementations to dynamically disable push-based
> shuffle merge during registration if needed.
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