[GitHub] [arrow] lidavidm commented on pull request #9656: ARROW-11772: [C++] Provide reentrant IPC file reader

[GitBox]

lidavidm commented on pull request #9656:
URL: https://github.com/apache/arrow/pull/9656#issuecomment-828750816


   I verified things on EC2. ARROW-12560 will let us just always 'do the right 
thing' so to speak, but for now, it looks like _always_ transferring is 
beneficial in essentially all cases, so I've updated the PR.
   
   ![Local Median Scan Duration 
(s)(1)](https://user-images.githubusercontent.com/327919/116466740-de89a980-a83c-11eb-9878-bbc4bd20017c.png)
   ![S3 Median Scan Duration 
(s)(1)](https://user-images.githubusercontent.com/327919/116466754-e2b5c700-a83c-11eb-864b-9d735c4fb87c.png)
   
   


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