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Posted to common-issues@hadoop.apache.org by "Robert Joseph Evans (JIRA)" <ji...@apache.org> on 2011/06/03 21:46:47 UTC

[jira] [Commented] (HADOOP-7314) Add support for throwing UnknownHostException when a host doesn't resolve

    [ https://issues.apache.org/jira/browse/HADOOP-7314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13043998#comment-13043998 ] 

Robert Joseph Evans commented on HADOOP-7314:
---------------------------------------------

new UrlValidator(UrlValidator.ALLOW_ALL_SCHEMES); is called every time verifyHostnames is called.  It would probably be better to have a private member for this, and if it is reentrant have a static private instance.

> Add support for throwing UnknownHostException when a host doesn't resolve
> -------------------------------------------------------------------------
>
>                 Key: HADOOP-7314
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7314
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Jeffrey Naisbitt
>            Assignee: Jeffrey Naisbitt
>         Attachments: HADOOP-7314.patch
>
>
> As part of MAPREDUCE-2489, we need support for having the resolve methods (for DNS mapping) throw UnknownHostExceptions.  (Currently, they hide the exception).  Since the existing 'resolve' method is ultimately used by several other locations/components, I propose we add a new 'resolveValidHosts' method.

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