[HDFS-6620] Snapshot docs should specify about preserve options with cp command

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.5.0, 3.0.0-alpha1
• Fix Version/s: 2.5.0
• Component/s: namenode
• Hadoop Flags: Reviewed
• Assignee: Stephen Chu
• Reporter: Uma Maheswara Rao G
• Created: 02/Jul/14 06:17
• Updated: 12/May/16 18:13
• Resolved: 03/Jul/14 16:16

Description

Currently snapshot docs contains the cp command details for copying the snapshot files to regular dfs tree.

http://hadoop.apache.org/docs/r2.3.0/hadoop-project-dist/hadoop-hdfs/HdfsSnapshots.html#Snapshot_Paths

Copying a file from snapshot s0:
hdfs dfs -cp /foo/.snapshot/s0/bar /tmp

Since there are important properties(acls, xattrs..etc) for a file may need to copy back. But looking at this doc may mislead to copy with out using any options. So, It may be worth mentioning aboit that properties. Infact it should copy all properties by default from snapshot file.