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https://issues.apache.org/jira/browse/HADOOP-12687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15285925#comment-15285925
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Rohith Sharma K S commented on HADOOP-12687:
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Linking to YARN-4478, few useful discussion happened related to this issue.
Discussion starts from this
[comment|https://issues.apache.org/jira/browse/YARN-4478?focusedCommentId=15174874&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15174874]
> SecureUtil#getByName should also try to resolve direct hostname, incase
> multiple loopback addresses are present in /etc/hosts
> -----------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-12687
> URL: https://issues.apache.org/jira/browse/HADOOP-12687
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Junping Du
> Assignee: Sunil G
> Priority: Blocker
> Labels: security
> Attachments: 0001-YARN-4352.patch, 0002-YARN-4352.patch,
> 0003-HADOOP-12687.patch, 0004-HADOOP-12687.patch
>
>
> From
> https://builds.apache.org/job/PreCommit-YARN-Build/9661/artifact/patchprocess/patch-unit-hadoop-yarn-project_hadoop-yarn_hadoop-yarn-client-jdk1.7.0_79.txt,
> we can see the tests in TestYarnClient, TestAMRMClient and TestNMClient get
> timeout which can be reproduced locally.
> When {{/etc/hosts}} has multiple loopback entries,
> {{InetAddress.getByName(null)}} will be returning the first entry present in
> etc/hosts. Hence its possible that machine hostname can be second in list and
> cause {{UnKnownHostException}}.
> Suggesting a direct resolve for such hostname scenarios.
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