[HADOOP-18502] Hadoop metrics should return 0 when there is no change

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.4.0
• Fix Version/s: 3.4.0
• Component/s: metrics
• Labels: pull-request-available
• Target Version/s: 3.4.0
• Hadoop Flags: Reviewed
• Assignee: leo sun
• Reporter: leo sun
• Created: 21/Oct/22 06:41
• Updated: 27/Jan/24 09:06
• Resolved: 09/Nov/22 02:24

Description

When we try to switch active NN to standby, we find that the getContentSummary average time is always a very high value even if there is no more query. For us, the metrics return 0 is more reasonable. The monitor is as below:

 

Issue Links

• links to: GitHub Pull Request #5058