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https://issues.apache.org/jira/browse/YARN-9332?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Weiwei Yang updated YARN-9332:
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Issue Type: Improvement (was: Bug)
> RackResolver tool should accept multiple hosts
> ----------------------------------------------
>
> Key: YARN-9332
> URL: https://issues.apache.org/jira/browse/YARN-9332
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: yarn
> Affects Versions: 2.9.2, 3.0.3, 2.8.5, 2.7.7, 3.1.2
> Reporter: Lantao Jin
> Assignee: Lantao Jin
> Priority: Minor
> Fix For: 3.3.0, 3.2.1
>
> Attachments: YARN-9332.001.patch, YARN-9332.002.patch,
> YARN-9332.003.patch
>
>
> RackResolver as a public rack resolver tool only offers a method {{public
> static Node resolve(String hostName)}} which only accepts one host a time.
> Actually the internal implementation class {{DNSToSwitchMapping}} always
> accept a host list as its input and return a list of resolved racks. That's
> cause the invoker like Spark takes a long time to resolve the rack info when
> handling abundant tasks (a mass of loops to execute script to resolve rack
> info).
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