Aias00 opened a new issue, #6570: URL: https://github.com/apache/shenyu/issues/6570
## Description `removeSelectData`/`removeRuleData` mutate the live `ArrayList` in place under `synchronized(SELECTOR_MAP)`, while `AbstractShenyuPlugin.execute` streams the same list (`matchSelector`/`matchRule`) without synchronization. Concurrent `removeIf` (structural modification) on an `ArrayList` while another thread streams it can throw `ConcurrentModificationException` and/or skip/duplicate entries. Note `selectorAccept` (the update path) correctly replaces the reference atomically — only the remove path mutates in place. ## Location ``` shenyu-plugin-base/.../cache/BaseDataCache.java:133-140 (removeSelectData), 191-198 (removeRuleData) readers at :173-174 (obtainSelectorData), AbstractShenyuPlugin.matchSelector/matchRule ``` ## Impact During config sync that deletes selectors/rules, concurrent requests matching that plugin can throw CME -> 500/exception and/or skip/duplicate entries. Both a correctness and a latency issue (errors under load during sync). ## Suggested fix Make `removeSelectData`/`removeRuleData` replace the reference with a new immutable list (like `selectorAccept` already does), or use `CopyOnWriteArrayList`, so readers never observe in-place mutation. ## Related existing issue(s) #6351 was a CME in a heartbeat subscriber (`ShenyuClientURIExecutorSubscriber`), a different class/path. _Identified during the 2026-08-02 audit; full list in [`docs/issue-candidates-2026-08-02.md`](docs/issue-candidates-2026-08-02.md)._ -- 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]
