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From "Owen O'Malley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2764) Fix renewal of dfs delegation tokens
Date Fri, 09 Sep 2011 17:53:09 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13101365#comment-13101365
] 

Owen O'Malley commented on MAPREDUCE-2764:
------------------------------------------

{quote}
Ah, I see, however getDTFromRemote isn't the right place to set the service. Forcing all tokens
to be converted to hftp tokens in this outside method is artificially limiting.
{quote}

Arguably, the code needs to be refactored. However, I need the hadoop fetchdt command to work
the same way. getDTfromRemote is the primitive that is used to fetch hftp tokens for both
the hftp filesystem and fetchdt. I was trying to minimize refactoring to the bare minimum,
since this was urgent for 205. 

> 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: Owen O'Malley
>             Fix For: 0.20.205.0
>
>         Attachments: MAPREDUCE-2764-2.patch, MAPREDUCE-2764-3.patch, MAPREDUCE-2764-4.patch,
MAPREDUCE-2764.patch, delegation.patch, token-renew.patch, token-renew.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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