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Posted to mapreduce-dev@hadoop.apache.org by "Daryn Sharp (JIRA)" <ji...@apache.org> on 2011/08/02 03:14:27 UTC

[jira] [Created] (MAPREDUCE-2764) Fix renewal of dfs delegation tokens

Fix renewal of dfs delegation tokens
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                 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


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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