juicewcode opened a new pull request, #7053:
URL: https://github.com/apache/shenyu/pull/7053
Fixes #6704
## Summary
- Build upstream lists in `UpstreamCheckService#fetchUpstreamData` with
`CopyOnWriteArrayList` instead of `LinkedList`.
- Prevent concurrent registration updates and scheduled health-check
iteration from causing
`ConcurrentModificationException`.
## Test
- Updated `UpstreamCheckServiceTest#testFetchUpstreamData` to verify the
loaded upstream lists are `CopyOnWriteArrayList`
instances.
- Kept the existing assertions for selector entries and upstream counts.
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