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From "Daryn Sharp (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2764) Fix renewal of dfs delegation tokens
Date Wed, 05 Oct 2011 21:22:29 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121489#comment-13121489

Daryn Sharp commented on MAPREDUCE-2764:

Arg, too many checkedout trees.  The earlier comment regarding {{SecurityUtil.buildTokenService()}}
is actually an issue.  If you revert to how it worked when the change went into 205, I'll
handle bringing the {{use_ip}} changes in via HADOOP-7510.
> 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:, 0.23.0
>         Attachments: MAPREDUCE-2764-2.patch, MAPREDUCE-2764-3.patch, MAPREDUCE-2764-4.patch,
MAPREDUCE-2764.patch, delegation.patch, token-renew-trunk.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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