juicewcode opened a new pull request, #7062:
URL: https://github.com/apache/shenyu/pull/7062
Fixes #6857
## Summary
- Replace mutable upstream `ArrayList` instances with
`CopyOnWriteArrayList`.
- Prevent request threads from observing unsafe concurrent modifications
made by health-check threads.
- Preserve the existing synchronization for compound upstream update
operations.
## Test
- Add a regression test verifying that upstream lists use
`CopyOnWriteArrayList`.
- Verify that an existing iterator retains a stable snapshot when an
upstream is added.
- Verify that subsequent reads observe the newly added upstream.
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