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https://issues.apache.org/jira/browse/MAPREDUCE-3960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13221227#comment-13221227
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Thomas Graves commented on MAPREDUCE-3960:
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Yes I tested it manually, since as you said there aren't many unit tests and
its pretty hard to unit test. created host with an IP alias and specified that
as the config for the RM and verified requests failed without the change and
then that requests succeeded with the change.
> web proxy doesn't forward request to AM with configured hostname/IP
> -------------------------------------------------------------------
>
> Key: MAPREDUCE-3960
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3960
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.0
> Reporter: Thomas Graves
> Assignee: Thomas Graves
> Priority: Critical
> Attachments: MAPREDUCE-3960.patch
>
>
> If the host the web proxy is running on has an ip alias or similar and the
> config file is pointing to the hostname that is the aliased ip of the box,
> the web proxy will send the request from the base ip rather then the aliased
> ip and the AM will redirect that request to the proxy again instead of
> accepting it.
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