[HDFS-4095] Add snapshot related metrics

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Snapshot (HDFS-2802)
• Component/s: datanode, namenode
• Hadoop Flags: Reviewed
• Assignee: Jing Zhao
• Reporter: Jing Zhao
• Created: 21/Oct/12 02:03
• Updated: 02/Nov/12 05:02
• Resolved: 02/Nov/12 05:01

Description

Add metrics for number of snapshots in the system, including 1) number of snapshot files, and 2) number of snapshot only files (snapshot file that are not deleted but the original file is already deleted).

Issue Links

• relates to: HDFS-4144 Create test for all snapshot-related metrics