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
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.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
