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https://issues.apache.org/jira/browse/SPARK-27038?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16794002#comment-16794002
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Marcelo Vanzin commented on SPARK-27038:
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I was looking for something completely different and ran into a bug already
filed for this exact issue: SPARK-13704
> Rack resolving takes a long time when initializing TaskSetManager
> -----------------------------------------------------------------
>
> Key: SPARK-27038
> URL: https://issues.apache.org/jira/browse/SPARK-27038
> Project: Spark
> Issue Type: Bug
> Components: YARN
> Affects Versions: 2.4.0
> Reporter: Lantao Jin
> Priority: Major
>
> If submits a stage with abundant tasks, rack resolving takes a long time when
> initializing TaskSetManager caused by a mass of loops to execute rack
> resolving script.
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