Github user uncleGen commented on the issue:

    https://github.com/apache/spark/pull/15915
  
    @srowen The truth is that `chunk size` is passed from different code path 
with different value. There is not a reasonable value when `chunk size` as a 
invalid value. Experiencedly, `chunk size` does not need a large value, 
although it can be. Besides, we can give it a special config, and restrict it a 
reasonable value, like not larger than 16MB or something else. But you said no 
to add new config.


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