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https://issues.apache.org/jira/browse/HADOOP-7422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13503448#comment-13503448
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Ashish Gandhi commented on HADOOP-7422:
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Found http://wiki.apache.org/hadoop/HowToContribute.
> Test that the topology script is always passed IP addresses
> -----------------------------------------------------------
>
> Key: HADOOP-7422
> URL: https://issues.apache.org/jira/browse/HADOOP-7422
> Project: Hadoop Common
> Issue Type: Test
> Components: test
> Reporter: Eli Collins
> Labels: newbie
>
> Now that HADOOP-6682 has been fixed, Hadoop should always pass the topology
> script an IP address rather than a hostname. We should write a test that
> covers this (specifically that DNSToSwitchMapping#resolve is always passed IP
> addresses) so users can safely write topology scripts that don't handle
> hostnames.
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