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https://issues.apache.org/jira/browse/SPARK-36892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17422533#comment-17422533
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Gengliang Wang commented on SPARK-36892:
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[~zhouyejoe] Thank you!
> Disable batch fetch for a shuffle when push based shuffle is enabled
> --------------------------------------------------------------------
>
> Key: SPARK-36892
> URL: https://issues.apache.org/jira/browse/SPARK-36892
> Project: Spark
> Issue Type: Bug
> Components: Shuffle
> Affects Versions: 3.2.0
> Reporter: Mridul Muralidharan
> Priority: Blocker
>
> When push based shuffle is enabled, efficient fetch of merged mapper shuffle
> output happens.
> Unfortunately, this currently interacts badly with
> spark.sql.adaptive.fetchShuffleBlocksInBatch, potentially causing shuffle
> fetch to hang and/or duplicate data to be fetched, causing correctness issues.
> Given batch fetch does not benefit spark stages reading merged blocks when
> push based shuffle is enabled, ShuffleBlockFetcherIterator.doBatchFetch can
> be disabled when push based shuffle is enabled.
> Thx to [~Ngone51] for surfacing this issue.
> +CC [~Gengliang.Wang]
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