MapR 5.0 Documentation : snapshots-dir

At the top level of each volume is a directory called .snapshot containing all the snapshots for the volume. You can view the directory with hadoop fs commands or by mounting the cluster with NFS. To prevent recursion problems, ls and hadoop fs -ls do not show the .snapshot directory when the top-level volume directory contents are listed. You must navigate explicitly to the .snapshot directory to view and list the snapshots for the volume.

Example:

root@node41:/opt/mapr/bin# hadoop fs -ls /myvol/.snapshot
Found 1 items
drwxrwxrwx   - root root          1 2011-06-01 09:57 /myvol/.snapshot/2011-06-01.09-57-49