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https://issues.apache.org/jira/browse/YARN-9394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16809476#comment-16809476
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Lantao Jin commented on YARN-9394:
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Attache [^YARN-9394.003.patch] to address checkstyle.
> Use new API of RackResolver to get better performance
> -----------------------------------------------------
>
> Key: YARN-9394
> URL: https://issues.apache.org/jira/browse/YARN-9394
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: yarn
> Affects Versions: 3.3.0, 3.2.1
> Reporter: Lantao Jin
> Assignee: Lantao Jin
> Priority: Major
> Attachments: YARN-9394.001.patch, YARN-9394.002.patch,
> YARN-9394.003.patch
>
>
> After adding a new API in RackResolver YARN-9332, some old callers should
> switch to new API to get better performance. As an example, Spark
> [YarnAllocator|https://github.com/apache/spark/blob/733f2c0b98208815f8408e36ab669d7c07e3767f/resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocator.scala#L361-L363]
> for Dynamic Allocation invokes
> [https://github.com/apache/hadoop/blob/6fa229891e06eea62cb9634efde755f40247e816/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/api/impl/AMRMClientImpl.java#L550]
> to resolve racks in a loop.
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