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https://issues.apache.org/jira/browse/SPARK-36892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17422425#comment-17422425
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Ye Zhou commented on SPARK-36892:
---------------------------------

I am working on this issue. We have a job which can reproduce this hanging 
issue and after disabling the batch fetch, the job can go through. Will post PR 
soon.

> 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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