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From "Vinayakumar B (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12687) SecureUtil#getByName should also try to resolve direct hostname, incase multiple loopback addresses are present in /etc/hosts
Date Fri, 20 May 2016 06:30:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15292812#comment-15292812
] 

Vinayakumar B commented on HADOOP-12687:
----------------------------------------

bq. But in current case, with patch, direct look-up is being done after all check is done
including trailing dot and search domains. Is it still a RFC violation to lookup for direct
host?
Anyone can confirm this?


> 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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