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https://issues.apache.org/jira/browse/YARN-9297?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aihua Xu resolved YARN-9297.
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Resolution: Duplicate
> Renaming RM could cause application to crash
> --------------------------------------------
>
> Key: YARN-9297
> URL: https://issues.apache.org/jira/browse/YARN-9297
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: security
> Affects Versions: 2.6.0
> Reporter: Aihua Xu
> Priority: Major
>
> In this line, we are throwing UnknownHostException when any RM host can't
> resolve to ip address.
> https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/SecurityUtil.java#L448
> There are some cases that one RM needs to rename or map to different ip
> address, then it will crash the application although other RMs are running
> fine.
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