xiaojunxiang2023 opened a new pull request, #6138:
URL: https://github.com/apache/hadoop/pull/6138

   jira:  https://issues.apache.org/jira/browse/HDFS-17216
   
   When distcp copies small files (file size slightly smaller than the 
bandwidth), the throbber only starts to throb after 1 second, and the throttled 
is specific to a single file. so the throbber becomes invalid, causing distcp 
to fill the cluster bandwidth and crush production traffic, which is a terrible 
thing.
   
![DiscpAnalyze](https://github.com/apache/hadoop/assets/65019264/db2f6347-8ff9-4b51-bb3d-11026c091a43)
   


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