coders1122 opened a new issue, #35319: URL: https://github.com/apache/arrow/issues/35319
### Describe the usage question you have. Please include as many useful details as possible. Why is it marked MAP_PRIVATE [here](https://github.com/apache/arrow/blob/9009dd76e4e9a2f4f13340ebf4173e71813b359b/cpp/src/arrow/io/file.cc#L449)? Is there a reason why you've explicitly chosen to not (also) use `MAP_SHARED` similar to write? We are trying to evaluate if this causes multiple workers (in a distributed training) to `mmap` multiple times instead of reusing the same mmap'ed file and reduce memory usage? ### Component(s) C++ -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
