[HBASE-16661] Add last major compaction age to per-region metrics

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.3.0, 2.0.0
• Hadoop Flags: Reviewed
• Release Note: This adds a new per-region metric named "lastMajorCompactionAge" for tracking time since the last major compaction ran on a given region. If a major compaction has never run, the age will be equal to the current timestamp.
• Assignee: Dustin Pho
• Reporter: Gary Helmling
• Created: 20/Sep/16 21:12
• Updated: 09/Nov/17 01:40
• Resolved: 10/Oct/16 22:33

Description

After HBASE-12859, we can now track the last major compaction timestamp for each region. However, this is only exposed through cluster status reporting and the admin API.

We have similar per-region metrics around storefile age, but none that filters on major compaction specifically.

Let's add a metric for last major compaction age.