[HDFS-4666] Disallow users to create file/dir named ".snapshot"

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Snapshot (HDFS-2802)
• Component/s: namenode
• Hadoop Flags: Incompatible change, Reviewed

Release Note

This is an INCOMPATIBLE CHANGE: ".snapshot" becomes a reserved inode name so that users cannot create a file/directory with ".snapshot" as the name. If ".snapshot" is used in a previous version of HDFS, it must be renamed before upgrade; otherwise, upgrade will fail.

• Assignee: Tsz-wo Sze
• Reporter: Jing Zhao
• Created: 03/Apr/13 21:31
• Updated: 31/Dec/13 23:21
• Resolved: 15/Apr/13 21:45

Description

Currently ".snapshot" is reserved by snapshots as a special tag to specify the path leading to snapshot copies. We should disallow users to create file/dir using name ".snapshot".

Issue Links

• is related to: HBASE-8352 Rename '.snapshot' directory
• is related to: HDFS-5709 Improve NameNode upgrade with existing reserved paths and path components
• relates to: HDFS-4691 Disallow .reserved path component, given that HDFS-4434 does not allow /.reserved