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https://issues.apache.org/jira/browse/MAPREDUCE-2764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13095463#comment-13095463
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Owen O'Malley commented on MAPREDUCE-2764:
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Yeah, I had to track through the code to make sure that I had it right, but
StreamFile calls down into JspHelper.getUGI. That clobbers the service to point
to the NameNode's rpc address. So as long as the HFTP client sets the kind back
to HDFS, we will stay backwards compatible and still work.
> Fix renewal of dfs delegation tokens
> ------------------------------------
>
> Key: MAPREDUCE-2764
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2764
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Fix For: 0.20.205.0
>
> Attachments: MAPREDUCE-2764-2.patch, MAPREDUCE-2764.patch,
> delegation.patch
>
>
> The JT may have issues renewing hftp tokens which disrupt long distcp jobs.
> The problem is the JT's delegation token renewal code is built on brittle
> assumptions. The token's service field contains only the "ip:port" pair.
> The renewal process assumes that the scheme must be hdfs. If that fails due
> to a {{VersionMismatchException}}, it tries https based on another assumption
> that it must be hftp if it's not hdfs. A number of other exceptions, most
> commonly {{IOExceptions}}, can be generated which fouls up the renewal since
> it won't fallback to https.
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