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https://issues.apache.org/jira/browse/MAPREDUCE-4064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13238696#comment-13238696
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Robert Joseph Evans commented on MAPREDUCE-4064:
------------------------------------------------

You took out the rest of the URL, so the only thing that you can get through 
the proxy is the base URL.

http://<SOMETHING>/proxy/application_.../some/important/path

will get translated into

http://<HISTORY>/jobhistory/job/job_.../

 or more importantly

http://<MR_AM>/

"/some/important/path" will be thrown away.  This may not be that critical for 
the history server where we redirect, but no AM UI that actually goes through 
the proxy is going to work properly after this change.
                
> Job History Link in RM UI is redirecting to the URL which contains Job Id 
> twice
> -------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-4064
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4064
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 0.23.1
>            Reporter: Devaraj K
>            Assignee: Devaraj K
>         Attachments: MAPREDUCE-4064.patch
>
>
> {code:xml}
> http://xx.x.x.x:19888/jobhistory/job/job_1332435449546_0001/jobhistory/job/job_1332435449546_0001
> {code}

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