jacktengg opened a new pull request, #19847:
URL: https://github.com/apache/doris/pull/19847

   # Proposed changes
   
   Issue Number: close #xxx
   
   ## Problem summary
   
   For broadcast join, only one build fragment instance will build hash table, 
other fragment instances just receive and throw away build side data, this is 
waste of memory and cpu.
   
   This PR improve this condition, data stream receiver tells sender that it 
does not need data from sender, and sender stops sending anydata to it.
   
   ## Checklist(Required)
   
   * [ ] Does it affect the original behavior
   * [ ] Has unit tests been added
   * [ ] Has document been added or modified
   * [ ] Does it need to update dependencies
   * [ ] Is this PR support rollback (If NO, please explain WHY)
   
   ## Further comments
   
   If this is a relatively large or complex change, kick off the discussion at 
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you 
chose the solution you did and what alternatives you considered, etc...
   
   


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