[HDFS-5115] Make StorageID a UUID

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha1
• Component/s: datanode
• Target Version/s: Heterogeneous Storage (HDFS-2832)
• Hadoop Flags: Reviewed
• Assignee: Arpit Agarwal
• Reporter: Arpit Agarwal
• Created: 20/Aug/13 19:28
• Updated: 12/May/16 18:18
• Resolved: 22/Aug/13 23:21

Description

The Storage ID is currently generated from the DataNode's IP+Port+Random components. This scheme will not work when we have separate Storage IDs for each storage directory as there is a possibility of conflicts when an unreliable storage is intermittently offline.

Converting it to a UUID makes collisions very unlikely.