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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