HFTP client should support relogin from keytab
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Key: HDFS-1364
URL: https://issues.apache.org/jira/browse/HDFS-1364
Project: Hadoop HDFS
Issue Type: Bug
Components: security
Reporter: Kan Zhang
Assignee: Kan Zhang
If a user starts a long-running HFTP client using a keytab, we should do
relogin automatically whenever TGT expires. Currently, HFTP client uses TGT to
fetch a delegation token and cache that delegation token for HFTP operations.
The delegation token is automatically renewed/refetched using TGT. However,
when TGT expires, delegation token renewal/refetch will fail and no further
HFTP operation is possible. This is unsatisfactory since the user has given us
her keytab. We should be able to relogin from keytab and continue.
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