f1amingo opened a new pull request, #10424: URL: https://github.com/apache/rocketmq/pull/10424
## What is the purpose of the change Close #10423 `LiteConsumerLagCalculator.getLagCountTopK` currently calls `getStoreTimestamp()` (disk I/O) for **every** offset entry, creates a `LiteLagInfo` for each, and uses `String.split()` for key parsing. This PR optimizes these hotspots. ## Brief changelog - **Defer `getStoreTimestamp` to topK results only**: accumulate `consumerOffset` in `LiteLagInfo` during traversal, compute timestamps for the final topK entries after heap filtering (N → K calls). - **Lazy object creation**: only instantiate `LiteLagInfo` when the entry qualifies for heap insertion. - **Replace `split()` with `indexOf()`**: parse `topicAtGroup` key via `indexOf` + `substring`, avoiding array allocation; check lite prefix before string extraction. - **Replace `AtomicLong` with `long[]`**: single-threaded traversal needs no atomic overhead. ## Verifying this change Existing unit tests cover the changed methods. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
