[HDFS-16882] RBF: Add cache hit rate metric in MountTableResolver#getDestinationForPath

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.3.4
• Fix Version/s: 3.4.0, 3.3.6
• Component/s: rbf
• Labels: pull-request-available
• Target Version/s: 3.4.0, 3.3.6
• Hadoop Flags: Reviewed
• Assignee: farmmamba
• Reporter: farmmamba
• Created: 04/Jan/23 02:40
• Updated: 28/Jan/24 07:29
• Resolved: 11/Feb/23 00:02

Description

Currently, the default value of "dfs.federation.router.mount-table.cache.enable" is true and the default value of "dfs.federation.router.mount-table.max-cache-size" is 10000.

But there is no metric that display cache hit rate, I think we can add a hit rate metric to watch the Cache performance and better tuning the parameters.

Issue Links

• links to: GitHub Pull Request #5275
• links to: GitHub Pull Request #5276
• links to: GitHub Pull Request #5423