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https://issues.apache.org/jira/browse/SPARK-3287?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-3287.
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Resolution: Not a Problem
Last update on the PR a while ago says that this was likely already fixed.
> When ResourceManager High Availability is enabled, ApplicationMaster webUI is
> not displayed.
> --------------------------------------------------------------------------------------------
>
> Key: SPARK-3287
> URL: https://issues.apache.org/jira/browse/SPARK-3287
> Project: Spark
> Issue Type: Bug
> Components: YARN
> Affects Versions: 1.0.2
> Reporter: Benoy Antony
> Attachments: SPARK-3287.patch
>
>
> When ResourceManager High Availability is enabled, there will be multiple
> resource managers and each of them could act as a proxy.
> AmIpFilter is modified to accept multiple proxy hosts. But Spark
> ApplicationMaster fails to read the ResourceManager IPs properly from the
> configuration.
> So AmIpFilter is initialized with an empty set of proxy hosts. So any access
> to the ApplicationMaster WebUI will be redirected to port RM port on the
> local host.
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