Github user jinxing64 commented on the issue:

    https://github.com/apache/spark/pull/16989
  
    @cloud-fan 
    Thank you very much for reviewing this thus far :)
    >How about we always fetch to disk if the block size is over 
maxBytesInFlight?
    I super agree with this. It's to use `maxBytesInFlight` as a cap for 
controlling the memory. 
    
    I changed it to be below:
    ```
    // Shuffle remote blocks to disk when local memory shortage or the request 
is too large.
    if (acquired < req.size || bytesInFlight > maxBytesInFlight) {
      ...
      
    }
    ```


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