zhztheplayer commented on pull request #7030:
URL: https://github.com/apache/arrow/pull/7030#issuecomment-660927861


   Sorry I am reconsidering whether to use JVM direct memory as a limit of 
native buffer allocation. By Oracle's explanation[1] about direct memory, 
direct memory seems only to limit direct byte buffer allocations. As the 
discussion has lasted for days I'll send a mail for this topic. Hopefully we 
can make a conclusion :)
   
   [1] https://docs.oracle.com/cd/E15289_01/JRCLR/optionxx.htm#BABGCFFB


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