getDelegationToken in HftpFileSystem should renew TGT if needed.
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Key: HDFS-1656
URL: https://issues.apache.org/jira/browse/HDFS-1656
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: Federation Branch
Reporter: Jitendra Nath Pandey
Assignee: Jitendra Nath Pandey
Fix For: Federation Branch
Fetching of delegation tokens in HftpFileSystem will fail if TGT has expired.
The TGT should be renewed first if needed.
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