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Posted to yarn-dev@hadoop.apache.org by "Lantao Jin (JIRA)" <ji...@apache.org> on 2019/02/26 09:15:00 UTC

[jira] [Created] (YARN-9332) RackResolver tool should accept multiple hosts

Lantao Jin created YARN-9332:
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             Summary: RackResolver tool should accept multiple hosts
                 Key: YARN-9332
                 URL: https://issues.apache.org/jira/browse/YARN-9332
             Project: Hadoop YARN
          Issue Type: Bug
          Components: yarn
    Affects Versions: 3.1.2, 2.7.7, 2.8.5, 3.0.3, 2.9.2
            Reporter: Lantao Jin
            Assignee: Lantao Jin


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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