eric baldeschwieler created HDFS-3699:
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             Summary: HftpFileSystem should try both KSSL and SPNEGO when 
authentication is required
                 Key: HDFS-3699
                 URL: https://issues.apache.org/jira/browse/HDFS-3699
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: eric baldeschwieler


See discussion in HDFS-2617 (Replaced Kerberized SSL for image transfer and 
fsck with SPNEGO-based solution).

To handle the transition from Hadoop1.0 systems running KSSL authentication to 
Hadoop systems running SPNEGO, it would be good to fix the client in both 1 and 
2 to try SPNEGO and then fall back to try KSSL.  

This will allow organizations that are running a lot of Hadoop 1.0 to gradually 
transition over, without needing to convert all clusters at the same time.  
They would first need to update their 1.0 HFTP clients (and 2.0/0.23 if they 
are already running those) and then they could copy data between clusters 
without needing to move all clusters to SPNEGO in a big bang.



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