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https://issues.apache.org/jira/browse/SPARK-54536?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-54536:
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Assignee: angerszhu
> Shuffle FetchWaitTime missing first call fetchUpToMaxBytes() open block rpc
> response time
> ------------------------------------------------------------------------------------------
>
> Key: SPARK-54536
> URL: https://issues.apache.org/jira/browse/SPARK-54536
> Project: Spark
> Issue Type: Task
> Components: Spark Core
> Affects Versions: 3.2.4, 4.0.1
> Reporter: angerszhu
> Assignee: angerszhu
> Priority: Major
> Labels: pull-request-available
> Attachments: image-2025-11-27-15-53-16-649.png
>
>
> When ShuffleBlockFetcherIterator initialize, call fetchUpToMaxBytes then call
> fetchAllHostLocalBlocks, but fetchAllHostLocalBlocks requests always need to
> wait fetchUpToMaxBytes's open block request return then can return. if open
> block request return slow, fetchRemoteWaitTime metrics difference is very
> large .
> !image-2025-11-27-15-53-16-649.png|width=746,height=564!
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