[HDFS-9715] Check storage ID uniqueness on datanode startup

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.7.2
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: datanode
• Hadoop Flags: Reviewed
• Assignee: Lei (Eddy) Xu
• Reporter: Lei (Eddy) Xu
• Created: 27/Jan/16 22:55
• Updated: 30/Aug/16 01:20
• Resolved: 03/Feb/16 02:16

Description

We should fix this to check storage ID uniqueness on datanode startup. If someone has manually edited the storage ID files, or if they have duplicated a directory (or re-added an old disk) they could end up with a duplicate storage ID and not realize it.

The HDFS-7575 fix does generate storage UUID for each storage, but not checks the uniqueness of these UUIDs.