ZanderXu commented on PR #4633:
URL: https://github.com/apache/hadoop/pull/4633#issuecomment-1195498441

   Thanks @WeisonWei for your contribution.  Can you add a UT to reproduce it? 
   
   If `DFS_ROUTER_QUOTA_ENABLE=false`,  doesn't `getEachQuotaUsage` return 
IOException?
   ```
   Map<RemoteLocation, QuotaUsage> getEachQuotaUsage(String path)
         throws IOException {
       rpcServer.checkOperation(OperationCategory.READ);
       if (!router.isQuotaEnabled()) {
         throw new IOException("The quota system is disabled in Router.");
       }
      ...
   }
   ```
   


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