Xiaoccer opened a new pull request, #12988:
URL: https://github.com/apache/doris/pull/12988

   # Proposed changes
   
   ## Problem summary
   
   In the VOlapScanNode:: transfer_thread (), the __transfer_done_ should be 
locked for modification before calling the cv.notify_all(). Otherwise,  the 
thread of VOlapScanNode::get_next() may not know the __transfer_done_ has been 
modified, and lose the notification before calling cv.wait_for(), which will 
cause the thread to wait for 1s. We can find that OlapScanNode has locked the 
__transfer_done_ in the same way.
   
   ## Checklist(Required)
   
   1. Does it affect the original behavior: 
       - [ ] Yes
       - [X] No
       - [ ] I don't know
   2. Has unit tests been added:
       - [ ] Yes
       - [X] No
       - [ ] No Need
   3. Has document been added or modified:
       - [ ] Yes
       - [X] No
       - [ ] No Need
   4. Does it need to update dependencies:
       - [ ] Yes
       - [X] No
   5. Are there any changes that cannot be rolled back:
       - [ ] Yes (If Yes, please explain WHY)
       - [X] No
   
   ## 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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