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https://issues.apache.org/jira/browse/SPARK-42719?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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He Qi updated SPARK-42719:
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Summary: `MapOutputTracker#getPreferredLocations` should respect
`spark.shuffle.reduceLocality.enabled` (was: `Map#getPreferredLocations`
should respect `spark.shuffle.reduceLocality.enabled`)
> `MapOutputTracker#getPreferredLocations` should respect
> `spark.shuffle.reduceLocality.enabled`
> -----------------------------------------------------------------------------------------------
>
> Key: SPARK-42719
> URL: https://issues.apache.org/jira/browse/SPARK-42719
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 3.5.0
> Reporter: He Qi
> Priority: Major
>
> Discuss as [https://github.com/apache/spark/pull/40307]
> {{getPreferredLocations}} in {{ShuffledRowRDD}} should return {{Nil}} at the
> very beginning in case {{spark.shuffle.reduceLocality.enabled = false}}
> (conceptually).
> This logic is pushed into MapOutputTracker though - and
> {{getPreferredLocationsForShuffle}} honors
> {{spark.shuffle.reduceLocality.enabled}} - but {{getMapLocation}} does not.
> So the fix would be to fix {{getMapLocation}} to honor the parameter.
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