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https://issues.apache.org/jira/browse/YARN-3714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14560500#comment-14560500
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Masatake Iwasaki commented on YARN-3714:
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In non-HA settings, if users do not explicitly set the
{{yarn.resourcemanager.webapp.address}} in configuration,
{{WebAppUtils#getResolvedRMWebAppURLWithoutScheme}} returns RM webapp address
based on the value of {{yarn.resourcemanager.hostname}} via the default value
set by yarn-default.xml.
{noformat}
<property>
<name>yarn.resourcemanager.webapp.address</name>
<value>${yarn.resourcemanager.hostname}:8088</value>
</property>
{noformat}
As a result, WebAppUtils#getProxyHostsAndPortsForAmFilter can return proper
proxy address.
This does not apply to {{yarn.resourcemanager.hostname._rm-id_}} in HA mode.
> AM proxy filter can not get proper default proxy address if RM-HA is enabled
> ----------------------------------------------------------------------------
>
> Key: YARN-3714
> URL: https://issues.apache.org/jira/browse/YARN-3714
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Masatake Iwasaki
> Assignee: Masatake Iwasaki
> Priority: Minor
>
> Default proxy address could not be got without setting
> {{yarn.resourcemanager.webapp.address._rm-id_}} and/or
> {{yarn.resourcemanager.webapp.https.address._rm-id_}} explicitly if RM-HA is
> enabled.
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