Fabriceli opened a new pull request, #9204:
URL: https://github.com/apache/apisix/pull/9204

   ### Description
   Thank you for your previous work @dyrnq
   
   Create TWO threads to watch the catalog services and health services:
   
   ```mermaid
   flowchart TD
                subgraph Thread 1: watch catalog
                A[Start] --> catalog{Catalog any change?}
       catalog -->|Yes| cindex[return catalog index]
       catalog ---->|No| E[End]
       cindex --> E
       end
       
       subgraph Thread 2: watch health
       A2[Start] --> health2{health any change?}
       health2 -->|Yes| hindex[return health index]
       health2 ---->|No| E2[End]
       hindex --> E2
       end
       
       subgraph Wait any thread
       A3[Start] --> spawn[Spawn TWO threads]
       spawn --> wait[wait any Thread]
       wait --> catalog2[Query all services]
       catalog2 --> H[Query health nodes]
       H --> update[Update all services]
       update --> e[End]
       end
   ```
   
   
   Fixes # (issue)
   Reference: #8856, https://github.com/apache/apisix/issues/8928
   
   ### Checklist
   
   - [x] I have explained the need for this PR and the problem it solves
   - [x] I have explained the changes or the new features added to this PR
   - [x] I have added tests corresponding to this change
   - [ ] I have updated the documentation to reflect this change
   - [x] I have verified that this change is backward compatible (If not, 
please discuss on the [APISIX mailing 
list](https://github.com/apache/apisix/tree/master#community) first)
   
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