[CASSANDRA-10023] Emit a metric for number of local read and write calls

• Type: Improvement
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 4.1-alpha1, 4.1
• Component/s: Observability/Metrics
• Labels: 4.0-feature-freeze-review-requested lhf
• Complexity: Low Hanging Fruit

Source Control Link

https://github.com/apache/cassandra/commit/c64ff69bd982e288fd9f19697cee01514ab5f838

Test and Documentation Plan

included

• Assignee: Stefan Miklosovic
• Reporter: Sankalp Kohli

Authors

Stefan Miklosovic

Reviewers

Brandon Williams, Stefan Miklosovic

• Created: 08/Aug/15 18:17
• Updated: 16/Nov/23 09:58
• Resolved: 03/Jan/22 14:00

Description

Many C* drivers have feature to be replica aware and chose the co-ordinator which is a replica. We should add a metric which tells us whether all calls to the co-ordinator are replica aware.

We have seen issues where client thinks they are replica aware when they forget to add routing key at various places in the code.

Issue Links

• causes: CASSANDRA-17424 Performance and Semantic Concerns w/ Metrics for Local vs. Remote Requests in StorageProxy