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https://issues.apache.org/jira/browse/HADOOP-8238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13243828#comment-13243828
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Aaron T. Myers commented on HADOOP-8238:
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+1, the patch looks good to me.
> NetUtils#getHostNameOfIP blows up if given ip:port string w/o port
> ------------------------------------------------------------------
>
> Key: HADOOP-8238
> URL: https://issues.apache.org/jira/browse/HADOOP-8238
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Eli Collins
> Assignee: Eli Collins
> Attachments: hadoop-8238.txt
>
>
> NetUtils#getHostNameOfIP blows up if not given a string of form ip:port,
> because the regex matches the port optionally but the code requires a
> semicolon. It also doesn't check the given string for null.
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