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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-2764) Fix renewal of dfs delegation tokens
Date Mon, 29 Aug 2011 23:52:39 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2764?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Daryn Sharp updated MAPREDUCE-2764:

    Attachment: MAPREDUCE-2764-2.patch

Untested patch that revises the original patch.  Preserves the initial goal of passing renew/cancel
directly back to the issuing object.

More cleanup is needed in hftp's mangling of services...  Ie. elimination of more code.

> 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:
>         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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