Ewan Higgs created HDFS-12666:
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             Summary: Provided Storage Mount Manager (PSMM) mount
                 Key: HDFS-12666
                 URL: https://issues.apache.org/jira/browse/HDFS-12666
             Project: Hadoop HDFS
          Issue Type: Sub-task
            Reporter: Ewan Higgs


Implement the Provided Storage Mount Manager. This is a service (thread) in the 
Namenode that manages backup mounts, unmounts, snapshotting, and monitoring the 
progress of backups.

On mount, the mount manager writes XATTR information at the top level of the 
mount to do the appropriate bookkeeping. This is done to maintain state in case 
the Namenode falls over.



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