suxiaogang223 opened a new pull request, #69138:
URL: https://github.com/apache/doris/pull/69138

   ### What problem does this PR solve?
   
   Issue Number: None
   
   Related PR: None
   
   Problem Summary: The randomized FederationBackendPolicy tests can generate 
one backend but request two distinct local hosts. The sampling loop then never 
terminates, leaving FE UT running indefinitely.
   
   Cap the host count by the available backend count in both tests. Run each 
with 1, 2, and 99 backends to cover the single-backend boundary on every 
execution while preserving the split-assignment assertions.
   
   ### Release note
   
   None
   
   ### Check List (For Author)
   
   - Test
       - [x] Unit Test: FederationBackendPolicyTest passed (16 tests); FE 
Checkstyle passed.
   - Behavior changed:
       - [x] No. Test-only change.
   - Does this need documentation?
       - [x] No.
   


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